bugzilla-data-medium.json

{"bugs":[{"creation_time":"2010-04-18T03:14:10Z","status":"ASSIGNED","component":"Layout","last_change_time":"2024-02-20T05:25:50Z","severity":"S3","priority":"--","id":560067,"keywords":["leave-open","perf","perf:resource-use","power"],"summary":"animated images inside visibility:hidden still eat CPU","op_sys":"All"},{"priority":"P1","id":1543783,"summary":"m.facebook.com live site loads 1s slower in Fenix/GVE than Fennec 64","op_sys":"Android","keywords":["perf:pageload"],"creation_time":"2019-04-11T18:20:49Z","component":"Performance: Navigation","status":"ASSIGNED","last_change_time":"2025-03-21T02:41:50Z","severity":"S3"},{"priority":"P3","id":1626816,"summary":"WebRender program cache / shader initialization blocks the main thread via the sync IPC message PWebRenderBridge::EnsureConnected (25ms-40ms startup penalty)","keywords":["perf:responsiveness"],"op_sys":"All","creation_time":"2020-04-02T00:26:08Z","component":"Graphics: WebRender","status":"ASSIGNED","last_change_time":"2025-04-11T01:43:41Z","severity":"S3"},{"op_sys":"Android","summary":"js::jit::GenerateCode spends a lot of time in malloc lock contention","keywords":[],"priority":"P3","id":1922073,"severity":"S3","last_change_time":"2025-01-06T15:03:33Z","status":"ASSIGNED","component":"JavaScript Engine: JIT","creation_time":"2024-10-01T18:43:40Z"},{"last_change_time":"2024-08-15T14:01:50Z","severity":"S3","creation_time":"2001-07-18T04:11:33Z","status":"NEW","component":"CSS Parsing and Computation","priority":"P3","id":91242,"keywords":["arch","perf","perf:startup"],"op_sys":"All","summary":"CSS parsing is 5.5% of startup time"},{"keywords":["perf"],"summary":"Page with lots of <pre> text (or rather: extremely deeply-nested inline tags, with lots of linebreaks) uses lots of memory in layout arenas and is slow to load","op_sys":"All","id":216418,"priority":"--","severity":"S3","last_change_time":"2023-05-15T19:04:00Z","component":"Layout","status":"NEW","creation_time":"2003-08-17T03:26:28Z"},{"keywords":["perf:pageload","perf:resource-use","perf:responsiveness","reproducible"],"summary":"firefox struggles with large doxygen html file in nsLocalFile::GetLastModifiedTime (from imgLoader)","op_sys":"All","id":304683,"priority":"--","component":"Graphics: ImageLib","status":"NEW","creation_time":"2005-08-15T08:01:49Z","severity":"S3","last_change_time":"2024-09-04T13:05:12Z"},{"summary":"Write a new off-the-main-thread IO driver for expat","op_sys":"All","keywords":["perf:pageload"],"id":651049,"priority":"--","severity":"S3","last_change_time":"2023-08-23T01:33:13Z","status":"NEW","component":"XML","creation_time":"2011-04-19T08:20:35Z"},{"component":"Graphics: ImageLib","status":"NEW","creation_time":"2014-06-18T15:22:41Z","severity":"S3","last_change_time":"2025-02-09T16:16:28Z","summary":"Make ImageLib share cached imgRequests for the same SVG document even if the URI has a different ref/hash","op_sys":"All","keywords":["perf:pageload","perf:resource-use","reproducible","testcase-wanted"],"priority":"--","id":1027106},{"op_sys":"All","keywords":["csectype-dos","hang","memory-leak","perf:responsiveness","reproducible","testcase"],"summary":"Website causes Firefox to completely hang because same script file is getting loaded over and over again","priority":"P2","id":1037984,"severity":"S3","last_change_time":"2024-06-04T18:21:25Z","component":"New Tab Page","status":"NEW","creation_time":"2014-07-13T16:33:17Z"},{"id":1107626,"priority":"P5","op_sys":"All","summary":"Evaluate aggregating timers to reduce the number of times we wake up the CPU for serving them","keywords":["perf:resource-use"],"creation_time":"2014-12-04T20:16:51Z","component":"DOM: Core & HTML","status":"NEW","last_change_time":"2025-03-27T16:27:51Z","severity":"S4"},{"op_sys":"All","summary":"Thumbnail generation should have a time limit","keywords":["memory-footprint","memory-leak","perf","perf:responsiveness","top-memory-leak"],"id":1162698,"priority":"P3","severity":"--","last_change_time":"2023-07-24T12:16:09Z","component":"New Tab Page","status":"NEW","creation_time":"2015-05-07T20:09:26Z"},{"component":"Session Restore","status":"NEW","creation_time":"2016-09-21T13:54:15Z","severity":"S3","last_change_time":"2025-03-11T08:54:17Z","summary":"Session Restore generates sustained large disk traffic [meta]","op_sys":"All","keywords":["meta","perf:animation","perf:resource-use","perf:responsiveness","reproducible"],"priority":"--","id":1304389},{"priority":"P3","id":1348469,"op_sys":"Unspecified","summary":"Consider using FramePropertyTable less in layout","keywords":["perf","perf:pageload"],"creation_time":"2017-03-18T03:14:39Z","status":"NEW","component":"Layout","last_change_time":"2022-10-11T19:06:39Z","severity":"S3"},{"last_change_time":"2022-10-11T19:07:40Z","severity":"S3","creation_time":"2017-03-23T02:16:50Z","component":"Application Update","status":"NEW","priority":"P3","id":1349809,"summary":"getElevationRequired janks the parent process by doing IO on the main thread","op_sys":"macOS","keywords":["perf","perf:responsiveness"]},{"id":1363131,"priority":"P3","op_sys":"Unspecified","keywords":["perf:responsiveness"],"summary":"Showing the bookmarks panel is too slow the first time","creation_time":"2017-05-08T18:35:31Z","component":"Bookmarks & History","status":"NEW","last_change_time":"2024-04-03T13:53:20Z","severity":"S3"},{"priority":"--","id":1363586,"keywords":["meta","perf","perf:responsiveness","perf:startup"],"op_sys":"Unspecified","summary":"[meta] Creating the XPCOM system info service shouldn't be expensive","creation_time":"2017-05-10T02:24:10Z","status":"NEW","component":"XPCOM","last_change_time":"2025-03-24T22:09:33Z","severity":"S3"},{"last_change_time":"2022-10-11T19:17:24Z","severity":"S3","creation_time":"2017-05-11T14:44:03Z","component":"Widget: Win32","status":"NEW","priority":"P3","id":1364091,"summary":"Defer mozilla::widget::AudioSession::Start() until later in startup","op_sys":"Unspecified","keywords":["perf","perf:responsiveness","perf:startup"]},{"severity":"S3","last_change_time":"2023-12-11T13:17:23Z","status":"NEW","component":"Security: PSM","creation_time":"2017-06-06T12:51:51Z","op_sys":"Unspecified","summary":"NSS should be initialized off main thread","keywords":["perf:responsiveness","perf:startup"],"priority":"P2","id":1370516},{"keywords":["perf:frontend","perf:startup","regression","regressionwindow-wanted"],"op_sys":"Unspecified","summary":"Add-on icons should be in the navbar by first paint","id":1374216,"priority":"P3","status":"NEW","component":"Toolbars and Customization","creation_time":"2017-06-19T08:52:46Z","severity":"S3","last_change_time":"2022-10-11T19:24:38Z"},{"creation_time":"2017-08-08T21:56:17Z","component":"JavaScript Engine","status":"NEW","last_change_time":"2024-12-06T16:27:49Z","severity":"S3","id":1388538,"priority":"P3","keywords":[],"summary":"Add ICs for slotful own-prop Xray property access (property on the expando)","op_sys":"Unspecified"},{"severity":"S3","last_change_time":"2022-10-11T19:37:50Z","status":"NEW","component":"JavaScript Engine","creation_time":"2017-08-25T20:33:04Z","keywords":["perf"],"op_sys":"All","summary":"Compiling the same script again and again for each embedded YouTube video","id":1393977,"priority":"P3"},{"priority":"P3","id":1400787,"op_sys":"macOS","keywords":["perf:resource-use"],"summary":"Using software video decoders (include VP9) ramps up computer fans on Macbook.","creation_time":"2017-09-18T08:13:45Z","component":"Audio/Video: Playback","status":"NEW","last_change_time":"2022-10-11T19:42:53Z","severity":"S3"},{"status":"NEW","component":"CSS Parsing and Computation","creation_time":"2017-10-07T10:11:51Z","severity":"S3","last_change_time":"2022-10-11T19:47:36Z","op_sys":"Unspecified","summary":"stylo: use invalidation framework to handle restyles needed in response to content insertion/removal","keywords":["perf:responsiveness"],"id":1406622,"priority":"P2"},{"priority":"P3","id":1425887,"op_sys":"All","keywords":["perf","perf:frontend"],"summary":"With tab animations disabled, closing current tab to switch to another will visibly show a blank page with spinner (causing flashing)","last_change_time":"2023-03-15T20:38:46Z","severity":"S3","creation_time":"2017-12-18T17:47:35Z","status":"NEW","component":"Tabbed Browser"},{"id":1428972,"priority":"P2","op_sys":"Unspecified","summary":"RexBench is slower than Chrome/WebKit","keywords":["perf"],"last_change_time":"2022-10-11T21:09:38Z","severity":"S3","creation_time":"2018-01-09T05:47:13Z","status":"NEW","component":"JavaScript Engine"},{"priority":"P3","id":1439892,"keywords":["perf:frontend","perf:startup"],"op_sys":"Unspecified","summary":"Activity stream initialization causes jank after receiving the sessionstore-windows-restored notification","last_change_time":"2024-04-03T03:06:41Z","severity":"S3","creation_time":"2018-02-21T13:15:04Z","component":"New Tab Page","status":"NEW"},{"severity":"S3","last_change_time":"2022-10-11T21:21:11Z","component":"CSS Parsing and Computation","status":"NEW","creation_time":"2018-03-05T04:29:30Z","op_sys":"Unspecified","keywords":["perf","perf:responsiveness"],"summary":"Try to understand why we're slower than Chrome on StyleBench \"Positional pseudo classes : Adding leaf elements: Async\" (& similar \"Removing\" measurement)","id":1443066,"priority":"P3"},{"summary":"The first startup after an update does main thread I/O to update.status several times","op_sys":"Unspecified","keywords":["perf:startup"],"priority":"P3","id":1446012,"severity":"S3","last_change_time":"2022-10-11T21:23:37Z","status":"NEW","component":"Application Update","creation_time":"2018-03-15T16:29:05Z"},{"priority":"P3","id":1454586,"summary":"Optimize resume point creation in IonBuilder","op_sys":"All","keywords":["perf"],"creation_time":"2018-04-17T08:42:34Z","status":"NEW","component":"JavaScript Engine: JIT","last_change_time":"2022-10-11T21:30:16Z","severity":"S3"},{"keywords":["perf","perf:responsiveness","perf:startup"],"summary":"nsJARChannel::asyncOpen can still block","op_sys":"Unspecified","priority":"P3","id":1456626,"severity":"S3","last_change_time":"2025-04-12T09:08:07Z","component":"Networking: JAR","status":"NEW","creation_time":"2018-04-24T20:33:58Z"},{"last_change_time":"2025-03-11T07:19:40Z","severity":"S3","creation_time":"2018-04-24T21:08:43Z","status":"NEW","component":"Web 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paints","op_sys":"Unspecified","keywords":["perf:resource-use"]},{"priority":"P3","id":1458634,"summary":"\"forget about this site\" in \"show all history\" blocks the main thread","op_sys":"Unspecified","keywords":["perf","perf:resource-use","perf:responsiveness"],"creation_time":"2018-05-02T18:01:37Z","component":"Bookmarks & History","status":"NEW","last_change_time":"2023-05-22T15:45:39Z","severity":"S3"},{"op_sys":"Unspecified","summary":"High variability in performance testing with large images","keywords":["perf:pageload"],"id":1468246,"priority":"P3","severity":"S3","last_change_time":"2022-10-11T21:41:13Z","component":"Layout","status":"NEW","creation_time":"2018-06-11T20:32:18Z"},{"keywords":["hang","perf:resource-use","power"],"op_sys":"All","summary":"High cpu/gpu usage and hangs on page-http://telegra.ph/Telegram-X-03-26 & other pages","id":1471029,"priority":"P3","severity":"S3","last_change_time":"2022-10-11T21:43:40Z","status":"NEW","component":"Audio/Video: Playback","creation_time":"2018-06-25T21:14:25Z"},{"id":1476101,"priority":"P2","summary":"Optimize Windows sandbox policy construction","op_sys":"Windows","keywords":["perf:responsiveness","perf:startup"],"last_change_time":"2022-10-11T21:47:20Z","severity":"S3","creation_time":"2018-07-16T20:44:07Z","status":"NEW","component":"Security: Process Sandboxing"},{"status":"NEW","component":"CSS Parsing and Computation","creation_time":"2018-07-27T10:44:44Z","severity":"S3","last_change_time":"2022-10-11T21:49:50Z","op_sys":"Unspecified","summary":"style.foo = bar changes are slow","keywords":["perf:responsiveness"],"priority":"P3","id":1478953},{"last_change_time":"2025-03-06T17:21:40Z","severity":"S3","creation_time":"2018-08-08T22:40:31Z","component":"Audio/Video: Playback","status":"NEW","id":1481967,"priority":"P3","summary":"100% cpu usage and high memory use on page with multiple embedded videos","op_sys":"All","keywords":["perf:resource-use"]},{"last_change_time":"2024-09-21T13:28:21Z","severity":"S3","creation_time":"2018-08-14T19:58:58Z","status":"NEW","component":"JavaScript Engine: JIT","priority":"P3","id":1483345,"keywords":[],"op_sys":"Unspecified","summary":"Try and re-attach NewObject stubs after GC"},{"id":1488435,"priority":"P3","summary":"Significant key input delay when typing on large Google Docs","op_sys":"macOS","keywords":[],"creation_time":"2018-09-04T14:10:08Z","component":"JavaScript Engine","status":"NEW","last_change_time":"2025-01-29T17:31:27Z","severity":"S3"},{"status":"NEW","component":"JavaScript Engine: JIT","creation_time":"2018-09-12T22:40:00Z","severity":"S3","last_change_time":"2023-07-18T21:09:40Z","op_sys":"Unspecified","keywords":["meta"],"summary":"[meta] Long-standing Ion Compilation Time Issues","priority":"P2","id":1490847},{"id":1490849,"priority":"P2","op_sys":"Unspecified","summary":"Off-Main-Thread Baseline Compilation","keywords":[],"creation_time":"2018-09-12T22:46:57Z","status":"NEW","component":"JavaScript Engine: JIT","last_change_time":"2025-01-28T17:04:25Z","severity":"S3"},{"keywords":["perf:resource-use"],"summary":"Horrible performance on runningworld due to media decoding","op_sys":"Unspecified","priority":"P3","id":1496096,"severity":"S3","last_change_time":"2025-03-06T17:21:31Z","status":"NEW","component":"Audio/Video: Playback","creation_time":"2018-10-03T15:02:45Z"},{"op_sys":"Android","summary":"hubs.mozilla.com frame rate with an empty scene is too slow in FxR on Oculus Go","keywords":["perf:responsiveness"],"id":1498485,"priority":"P3","severity":"S3","last_change_time":"2024-05-03T15:18:39Z","status":"NEW","component":"JavaScript Engine","creation_time":"2018-10-12T07:38:21Z"},{"severity":"S3","last_change_time":"2025-03-11T08:54:07Z","component":"CSS Parsing and Computation","status":"NEW","creation_time":"2018-10-26T12:54:03Z","keywords":["perf:animation","regression","reproducible","top50"],"op_sys":"All","summary":"Reddit content is no longer displayed when scrolled (checkerboarding), with long restyles","id":1502334,"priority":"--"},{"keywords":["perf:pageload"],"summary":"twitch.tv site loads slow compared to Chrome","op_sys":"Android","priority":"P2","id":1505192,"status":"NEW","component":"JavaScript Engine","creation_time":"2018-11-06T22:12:10Z","severity":"S3","last_change_time":"2022-10-11T22:10:59Z"},{"keywords":["perf:responsiveness"],"op_sys":"Unspecified","summary":"Getting a list of audio devices on about:support is super slow sometimes","priority":"P3","id":1505483,"severity":"S3","last_change_time":"2025-03-06T17:04:43Z","component":"Audio/Video","status":"NEW","creation_time":"2018-11-07T17:49:31Z"},{"status":"NEW","component":"Graphics","creation_time":"2018-11-07T19:32:59Z","severity":"S3","last_change_time":"2024-03-20T20:46:07Z","summary":"graphics data gathering (and/or canvas webgl context initialization) from about:support is slow","op_sys":"Unspecified","keywords":["main-thread-io","perf:responsiveness"],"priority":"P5","id":1505533},{"summary":"Do an optimization to not flush animations which are running on the compositor in various places where we call FlushPendingNotification","op_sys":"Unspecified","keywords":["perf:responsiveness"],"id":1506765,"priority":"P3","component":"DOM: Animation","status":"NEW","creation_time":"2018-11-13T04:54:48Z","severity":"S3","last_change_time":"2022-10-11T22:12:27Z"},{"component":"Tabbed Browser","status":"NEW","creation_time":"2018-11-13T21:07:29Z","severity":"S3","last_change_time":"2022-10-11T22:12:38Z","keywords":["perf:frontend","perf:responsiveness","perf:startup"],"op_sys":"Unspecified","summary":"Try persisting chromemargin and brighttext attributes on browser windows","priority":"P5","id":1506962},{"priority":"P3","id":1508765,"op_sys":"Unspecified","summary":"Firefox is very slow to render poster PDF","keywords":["parity-chrome","perf","perf:animation","perf:pageload","perf:responsiveness","regression","reproducible"],"last_change_time":"2023-07-24T12:22:05Z","severity":"S3","creation_time":"2018-11-20T19:36:06Z","component":"PDF Viewer","status":"NEW"},{"last_change_time":"2022-10-11T22:14:24Z","severity":"S3","creation_time":"2018-11-22T04:38:51Z","component":"DOM: Core & HTML","status":"NEW","id":1509228,"priority":"P3","summary":"Optimizing nsGlobalWindowOuter::NotifyContentBlockingState() seems to have an impact on pageload","op_sys":"Unspecified","keywords":["perf","perf:pageload"]},{"keywords":["perf","perf:pageload"],"summary":"Defer GCs in background tabs/processes during pageload","op_sys":"Unspecified","priority":"P3","id":1515414,"severity":"S3","last_change_time":"2022-10-11T22:19:55Z","component":"JavaScript: GC","status":"NEW","creation_time":"2018-12-19T19:35:51Z"},{"summary":"CPU intensive slideshow on http://thesantaclausparade.com/","op_sys":"Unspecified","keywords":["perf","perf:responsiveness"],"id":1515473,"priority":"P3","status":"NEW","component":"Graphics","creation_time":"2018-12-19T22:43:20Z","severity":"S3","last_change_time":"2024-08-03T20:54:28Z"},{"summary":"[meta] reduce impact/overhead of custom element use on startup","op_sys":"Unspecified","keywords":["meta","perf:frontend","perf:startup"],"id":1515799,"priority":"P3","severity":"S3","last_change_time":"2023-08-05T01:39:19Z","component":"General","status":"NEW","creation_time":"2018-12-20T23:13:35Z"},{"creation_time":"2018-12-27T14:05:19Z","component":"Downloads Panel","status":"NEW","last_change_time":"2022-10-11T22:20:48Z","severity":"S3","priority":"P5","id":1516525,"summary":"Download indicator code should use idle task and/or not load until there are downloads","op_sys":"Unspecified","keywords":["perf:frontend","perf:startup"]},{"status":"NEW","component":"CSS Parsing and Computation","creation_time":"2019-01-02T14:52:14Z","severity":"S3","last_change_time":"2022-10-11T22:21:13Z","summary":"Slow load and long delay before search field can be interacted with on https://scouts.org.uk","keywords":["perf:responsiveness"],"op_sys":"Unspecified","id":1517254,"priority":"P2"},{"severity":"S3","last_change_time":"2022-10-11T22:24:11Z","status":"NEW","component":"Layout","creation_time":"2019-01-17T08:50:51Z","summary":"jetbrains \"upsource\" file-view hangs the browser, when scrolled","op_sys":"Unspecified","keywords":["perf:responsiveness"],"priority":"P2","id":1520729},{"creation_time":"2019-01-23T18:40:07Z","status":"NEW","component":"Layout: Text and Fonts","last_change_time":"2022-10-11T22:25:37Z","severity":"S3","id":1522196,"priority":"P2","summary":"InitOtherFamilyNamesRunnable can slow down first page load and take > 100ms","keywords":["perf:pageload"],"op_sys":"All"},{"priority":"P3","id":1523028,"summary":"[meta] Performance of \"about:config\"","keywords":["meta","perf","perf:responsiveness","regression"],"op_sys":"All","last_change_time":"2025-03-02T13:58:32Z","severity":"S3","creation_time":"2019-01-26T00:23:18Z","component":"Preferences","status":"NEW"},{"op_sys":"macOS","keywords":["perf:responsiveness"],"summary":"Twitch.tv video's (vod) freeze during playback on MacOS","priority":"P3","id":1524384,"component":"Audio/Video: Playback","status":"NEW","creation_time":"2019-01-31T20:58:54Z","severity":"S3","last_change_time":"2025-03-17T17:28:58Z"},{"op_sys":"Unspecified","keywords":["perf:responsiveness"],"summary":"Scroll jank when mousewheel-scrolling slide thumbnails on Google Docs (with lots of time spent painting & in GetFrameForPoint)","id":1527037,"priority":"P2","status":"NEW","component":"Web Painting","creation_time":"2019-02-11T18:16:31Z","severity":"S3","last_change_time":"2022-10-11T22:29:04Z"},{"op_sys":"Unspecified","summary":"[meta] Allow call of AsyncOpen and OnStart/OnStopRequest off the main thread","keywords":["meta","perf:pageload"],"priority":"P2","id":1528285,"severity":"S3","last_change_time":"2023-06-30T18:02:44Z","component":"Networking: HTTP","status":"NEW","creation_time":"2019-02-15T16:08:16Z"},{"summary":"Lazy load browser.xul menus","keywords":["perf:frontend","perf:startup"],"op_sys":"Unspecified","priority":"P3","id":1534371,"component":"Menus","status":"NEW","creation_time":"2019-03-11T18:25:07Z","severity":"S3","last_change_time":"2023-08-05T01:38:55Z"},{"summary":"[10.14.4] Poor battery life on MacBook Pro","keywords":["perf","perf:resource-use"],"op_sys":"macOS","priority":"P3","id":1536622,"severity":"S3","last_change_time":"2023-02-01T17:22:05Z","component":"Graphics","status":"NEW","creation_time":"2019-03-19T21:20:53Z"},{"last_change_time":"2024-04-02T13:41:19Z","severity":"S3","creation_time":"2019-03-20T07:53:47Z","component":"General","status":"NEW","id":1536739,"priority":"P3","op_sys":"Unspecified","keywords":["perf:responsiveness"],"summary":"Performance is slow/janky with a full complement of add-ons, restored session, opening discarded tabs"},{"priority":"--","id":1538784,"keywords":["perf:resource-use"],"op_sys":"Unspecified","summary":"Set nsThreadPool limits more intelligently","creation_time":"2019-03-25T17:26:55Z","component":"XPCOM","status":"NEW","last_change_time":"2025-03-20T13:08:13Z","severity":"S3"},{"creation_time":"2019-03-26T20:57:57Z","status":"NEW","component":"Graphics","last_change_time":"2022-10-11T22:39:22Z","severity":"S3","priority":"P3","id":1539266,"summary":"Running gfxPlatform::Init in the content process can take a long time","keywords":["perf:responsiveness"],"op_sys":"Unspecified"},{"summary":"Brief video and audio interruptions on YouTube when tab is focused after it was in the background","op_sys":"Unspecified","keywords":["perf:responsiveness"],"id":1540226,"priority":"P2","component":"Graphics","status":"NEW","creation_time":"2019-03-29T19:18:26Z","severity":"S3","last_change_time":"2022-10-11T22:40:24Z"},{"severity":"S3","last_change_time":"2022-10-11T22:41:22Z","status":"NEW","component":"Crash Reporting","creation_time":"2019-04-02T20:18:11Z","summary":"Avoid nsExceptionHandler::SetupExtraData() doing main thread IO super early on startup","op_sys":"Unspecified","keywords":["main-thread-io","perf:startup"],"id":1541200,"priority":"P2"},{"creation_time":"2019-04-03T17:10:18Z","component":"Startup and Profile System","status":"NEW","last_change_time":"2024-07-25T20:36:55Z","severity":"S3","id":1541491,"priority":"P3","summary":"Evaluate whether we can stop using compatibility.ini in the common case where app compat info is in profiles.ini / installs.ini","op_sys":"Unspecified","keywords":["main-thread-io","perf","perf:startup"]},{"summary":"Stop writing compatibility.ini piecemeal and on the main thread and on startup","op_sys":"Unspecified","keywords":["main-thread-io","perf","perf:responsiveness","perf:startup"],"id":1541494,"priority":"P3","severity":"S3","last_change_time":"2022-10-11T22:41:40Z","component":"Startup and Profile System","status":"NEW","creation_time":"2019-04-03T17:15:49Z"},{"component":"Startup and Profile System","status":"NEW","creation_time":"2019-04-03T21:31:57Z","severity":"S3","last_change_time":"2024-01-29T10:01:40Z","summary":"Very very very carefully... remove channel-prefs.js and stop reading it from the main thread early on startup","op_sys":"Unspecified","keywords":["main-thread-io","perf","perf:startup"],"id":1541601,"priority":"--"},{"last_change_time":"2025-03-21T02:42:28Z","severity":"S3","creation_time":"2019-04-11T17:55:48Z","component":"Performance: Navigation","status":"NEW","priority":"P2","id":1543776,"op_sys":"Unspecified","summary":"[meta] 5+ second delays seen while loading www.allrecipes.com on geckoview_example","keywords":["meta","perf:pageload"]},{"creation_time":"2019-04-12T14:40:08Z","status":"NEW","component":"XPCOM","last_change_time":"2023-05-31T19:21:00Z","severity":"S3","id":1544019,"priority":"--","keywords":["main-thread-io","perf","perf:startup"],"op_sys":"Unspecified","summary":"Consolidate IO for startupCache folder 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System","status":"NEW","creation_time":"2019-04-30T16:38:33Z"},{"status":"NEW","component":"WebRTC","creation_time":"2019-05-02T14:17:10Z","severity":"S3","last_change_time":"2025-03-03T21:20:28Z","keywords":["perf:pageload"],"summary":"Stopping blocking bfcache on unconnected peerconnections","op_sys":"Unspecified","id":1548539,"priority":"P3"},{"last_change_time":"2025-04-01T07:58:20Z","severity":"S3","creation_time":"2019-05-22T16:11:19Z","status":"NEW","component":"Crash Reporting","id":1553536,"priority":"--","op_sys":"Unspecified","keywords":["main-thread-io","perf","perf:startup"],"summary":"Use minidump-analyzer to append Windows AV/spyware/firewall data to crashreport .extra file; add to telemetry environment data lazily"},{"priority":"P3","id":1553980,"op_sys":"Unspecified","summary":"Defer initial processing by Privileged Content process at startup","keywords":["perf:resource-use"],"creation_time":"2019-05-23T21:51:13Z","status":"NEW","component":"New Tab Page","last_change_time":"2022-10-11T22:52:58Z","severity":"S3"},{"last_change_time":"2023-02-22T18:35:16Z","severity":"S3","creation_time":"2019-05-24T15:01:19Z","status":"NEW","component":"XPCOM","priority":"--","id":1554200,"summary":"nsLocalFile's Clone method is too naive, should reuse more information from the original","op_sys":"Unspecified","keywords":["main-thread-io","perf:resource-use","perf:startup"]},{"last_change_time":"2025-02-12T03:06:45Z","severity":"S3","creation_time":"2019-05-24T20:22:15Z","component":"Safe Browsing","status":"NEW","priority":"P3","id":1554313,"summary":"Classifier Update should wait for an user-idle period before initiating an update","op_sys":"Unspecified","keywords":["perf:pageload","perf:responsiveness"]},{"keywords":["perf:pageload"],"op_sys":"Unspecified","summary":"StartupCache takes a very long time to write out cache after browser 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loading","keywords":["perf:resource-use","perf:startup"],"priority":"P3","id":1566487,"status":"NEW","component":"General","creation_time":"2019-07-16T15:55:54Z","severity":"S3","last_change_time":"2024-04-03T16:04:02Z"},{"priority":"P3","id":1568027,"keywords":["perf:responsiveness"],"summary":"WebRender performs worse on Binding of Isaac CodePen demo (svg filters/blob)","op_sys":"Unspecified","last_change_time":"2024-09-20T22:54:50Z","severity":"S3","creation_time":"2019-07-22T20:30:43Z","status":"NEW","component":"Graphics: WebRender"},{"component":"Performance: Navigation","status":"NEW","creation_time":"2019-07-30T18:44:15Z","severity":"S3","last_change_time":"2025-03-21T02:42:54Z","op_sys":"Unspecified","summary":"Investigate fast first paints","keywords":["perf:pageload"],"id":1570090,"priority":"P2"},{"id":1570616,"priority":"P3","op_sys":"Windows","summary":"[meta] Move away from sync CoCreateInstance to RoGetAgileReference or similar (to avoid mainthread 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GMP","status":"NEW","last_change_time":"2022-10-11T23:50:49Z","severity":"S3","priority":"P3","id":1609444,"summary":"GMP thread can write to disk (to clear storage or remove plugins) at xpcom-shutdown-threads time","keywords":["perf:responsiveness"],"op_sys":"Unspecified"},{"last_change_time":"2024-05-02T17:15:10Z","severity":"S3","creation_time":"2020-01-16T14:10:52Z","component":"General","status":"NEW","priority":"P3","id":1609682,"summary":"preload required content and parent process scripts at startup of GeckoView","op_sys":"All","keywords":["perf:pageload"]},{"severity":"S3","last_change_time":"2024-06-28T12:13:45Z","component":"Performance: General","status":"NEW","creation_time":"2020-02-06T20:58:06Z","op_sys":"All","summary":"[fission-power] Synchronize periodic background tasks (such as expiration tracker ticks) across content processes","keywords":["perf:resource-use"],"priority":"P2","id":1613760},{"op_sys":"Android","summary":"Apple Newsroom page takes a long time to load (30 seconds)","keywords":["perf:pageload"],"priority":"P2","id":1613824,"severity":"S3","last_change_time":"2025-03-21T02:41:36Z","component":"Performance: Navigation","status":"NEW","creation_time":"2020-02-07T04:18:58Z"},{"severity":"S3","last_change_time":"2024-09-02T15:26:30Z","component":"General","status":"NEW","creation_time":"2020-02-08T01:20:13Z","op_sys":"All","summary":"[meta] Move all devtools UI out of the parent process into a privileged content process","keywords":["meta","perf:responsiveness","sec-want"],"id":1614096,"priority":"--"},{"creation_time":"2020-02-10T18:50:35Z","status":"NEW","component":"Performance: Navigation","last_change_time":"2025-03-21T02:42:06Z","severity":"S3","priority":"P2","id":1614425,"summary":"https://www.fido.ca/ Pages load on mobile is several seconds slower than chrome","keywords":["perf:pageload"],"op_sys":"Android"},{"severity":"S3","last_change_time":"2022-10-12T00:00:07Z","status":"NEW","component":"General","creation_time":"2020-02-26T10:02:21Z","summary":"Very slow session restore (profile included)","op_sys":"Linux","keywords":["perf:frontend","perf:startup"],"id":1618129,"priority":"--"},{"creation_time":"2020-03-16T05:56:39Z","component":"Performance: Responsiveness","status":"NEW","last_change_time":"2025-04-07T12:29:52Z","severity":"--","priority":"--","id":1622721,"op_sys":"Windows 10","keywords":["perf:responsiveness"],"summary":"Slow performance when scrolling Firefox subreddit top posts of the week"},{"last_change_time":"2025-03-11T07:08:10Z","severity":"S3","creation_time":"2020-03-18T23:56:47Z","component":"General","status":"NEW","id":1623518,"priority":"P3","keywords":["meta","perf:responsiveness"],"summary":"[meta] Script cache information from the content process is never written to disk in GeckoView (10-20ms startup penalty for uncached script loading)","op_sys":"Android"},{"id":1625320,"priority":"P3","keywords":["main-thread-io","perf","perf:startup"],"op_sys":"Unspecified","summary":"gfxDWriteFontEntry::IsCJKFont() causes main thread I/O to times.ttf while reflowing the hidden window during startup","creation_time":"2020-03-26T22:16:00Z","component":"Graphics","status":"NEW","last_change_time":"2022-10-12T00:05:51Z","severity":"S3"},{"severity":"S3","last_change_time":"2022-04-01T11:20:52Z","status":"NEW","component":"Privacy: Anti-Tracking","creation_time":"2020-04-17T12:24:08Z","keywords":["perf:startup"],"op_sys":"Unspecified","summary":"URLDecorationAnnotationsService started very early during startup (profile-after-change)","priority":"P3","id":1630939},{"summary":"UrlClassifierSkipListService started during startup for uninteresting http requests","keywords":["perf:startup"],"op_sys":"Unspecified","priority":"P3","id":1630949,"status":"NEW","component":"Privacy: Anti-Tracking","creation_time":"2020-04-17T13:05:55Z","severity":"S3","last_change_time":"2022-03-28T19:20:38Z"},{"keywords":["perf:frontend","perf:startup"],"op_sys":"Unspecified","summary":"webRequest overhead for data: urls from about:newtab","priority":"P3","id":1630999,"status":"NEW","component":"New Tab Page","creation_time":"2020-04-17T15:40:19Z","severity":"S4","last_change_time":"2022-03-08T18:34:18Z"},{"keywords":["perf:startup"],"op_sys":"Unspecified","summary":"Investigate merging small files loaded during startup into one file","priority":"P3","id":1631927,"component":"General","status":"NEW","creation_time":"2020-04-21T20:25:52Z","severity":"--","last_change_time":"2022-03-09T16:28:55Z"},{"last_change_time":"2022-04-09T13:12:12Z","severity":"--","creation_time":"2020-04-27T20:49:57Z","status":"NEW","component":"General","priority":"P3","id":1633566,"summary":"Audit BrowserGlue.dispose for things that can likely be skipped at 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startup"},{"creation_time":"2020-05-14T20:22:45Z","component":"DOM: Navigation","status":"NEW","last_change_time":"2023-11-25T23:47:11Z","severity":"S3","priority":"P3","id":1638119,"summary":"Allow extension processes to be preallocated","keywords":["perf:resource-use"],"op_sys":"Unspecified"},{"creation_time":"2020-05-15T18:19:13Z","component":"Telemetry","status":"NEW","last_change_time":"2022-03-09T16:31:09Z","severity":"N/A","id":1638421,"priority":"P3","keywords":["perf:startup"],"summary":"Defer mozilla::intl::GetSystemLocales() until later in startup","op_sys":"Unspecified"},{"status":"NEW","component":"Networking","creation_time":"2020-05-28T21:05:25Z","severity":"S3","last_change_time":"2025-03-11T07:08:00Z","summary":"Firefox takes 50% more time than Microsoft Edge to display first paint of comments in reddit posts","op_sys":"Unspecified","keywords":["perf:pageload"],"id":1641696,"priority":"P3"},{"id":1644740,"priority":"--","summary":"Stop painting when the window is 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voice.google.com - Site can hang from seconds to minutes","op_sys":"Unspecified","keywords":["perf:responsiveness"],"id":1653088,"priority":"P3","severity":"S4","last_change_time":"2024-11-19T15:27:45Z","component":"JavaScript: GC","status":"NEW","creation_time":"2020-07-15T20:19:35Z"},{"priority":"P2","id":1653777,"summary":"WebGL aquarium sample runs at 30 FPS on Google Pixel 2, 60 FPS on WebView/Chromium","op_sys":"All","keywords":["perf:responsiveness"],"last_change_time":"2022-03-02T16:39:35Z","severity":"S3","creation_time":"2020-07-18T16:39:27Z","component":"Graphics: CanvasWebGL","status":"NEW"},{"severity":"S3","last_change_time":"2023-10-09T12:20:20Z","status":"NEW","component":"Debugger","creation_time":"2020-07-18T17:04:31Z","keywords":["leave-open","perf:responsiveness"],"summary":"Firefox freezes and becomes unusable on react/typescript/eval-source-map project","op_sys":"Unspecified","priority":"P3","id":1653779},{"status":"NEW","component":"Performance: 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page","keywords":["perf:pageload","regression","regressionwindow-wanted","reproducible","top50"],"id":1659166,"priority":"--","status":"NEW","component":"Layout: Columns","creation_time":"2020-08-14T18:12:37Z","severity":"S3","last_change_time":"2023-08-14T15:04:45Z"},{"creation_time":"2020-08-16T19:42:09Z","component":"Performance: Responsiveness","status":"NEW","last_change_time":"2025-04-07T12:30:22Z","severity":"--","priority":"P2","id":1659359,"op_sys":"Unspecified","keywords":["perf:responsiveness"],"summary":"Heavy janking while doing page up/down on while loading a few tabs in the background"},{"severity":"--","last_change_time":"2025-04-07T12:30:31Z","status":"NEW","component":"Performance: Responsiveness","creation_time":"2020-08-24T17:30:02Z","summary":"LinkedIn - high resource use (aka fans go crazy) on MacOS","op_sys":"macOS","keywords":["perf:responsiveness"],"priority":"P2","id":1660838},{"op_sys":"Windows 10","summary":"browser and content hangs when zooming map at https://mrosd.maps.arcgis.com/apps/webappviewer/index.html","keywords":["perf:responsiveness"],"priority":"--","id":1661090,"severity":"S3","last_change_time":"2022-03-02T16:40:07Z","status":"NEW","component":"Graphics","creation_time":"2020-08-25T17:52:00Z"},{"severity":"S3","last_change_time":"2025-03-21T02:41:27Z","status":"NEW","component":"Performance: Navigation","creation_time":"2020-09-08T20:28:35Z","op_sys":"Unspecified","summary":"9to5google article takes 2x as much time to load as Chrome","keywords":["perf:pageload","reproducible"],"priority":"P3","id":1663768},{"severity":"S3","last_change_time":"2025-03-11T00:09:42Z","component":"Networking: DNS","status":"NEW","creation_time":"2020-09-11T15:02:39Z","keywords":["perf:pageload","perf:responsiveness"],"op_sys":"Android","summary":"Extremely long DNS resolution times with Fenix, no fallback resolver","priority":"P2","id":1664492},{"summary":"Fenix loads apple.com 2 seconds slower than Chrome","op_sys":"Unspecified","keywords":["perf:pageload","reproducible"],"priority":"P2","id":1667246,"status":"NEW","component":"General","creation_time":"2020-09-24T22:23:03Z","severity":"S3","last_change_time":"2024-04-08T18:09:43Z"},{"component":"Widget: Win32","status":"NEW","creation_time":"2020-09-28T15:36:45Z","severity":"S3","last_change_time":"2023-11-25T00:24:02Z","keywords":["perf:responsiveness"],"summary":"Add Telemetry to measure how long JumpLists block the main thread in the wild","op_sys":"Unspecified","id":1667807,"priority":"P3"},{"last_change_time":"2024-07-17T17:29:49Z","severity":"S4","creation_time":"2020-10-09T09:09:08Z","component":"Performance: General","status":"NEW","priority":"P5","id":1670193,"op_sys":"Unspecified","keywords":["perf:resource-use","top50"],"summary":"Google Meet high energy impact on macOS 10.15.7"},{"priority":"P3","id":1671859,"keywords":["perf:responsiveness"],"summary":"Not responding notification from Firefox (in titlebar) when 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