Background Map is incredibly slow

[RubenKelevra]

I have a hard time using SC currently, because the map layer isn't loading or is loading after an extrem lag.

I was in a city center where I haven't been for a while, so SC had no cached tiles.

I had a good 3G+ connection and I don't have any bandwidth limit.

I opened the app (it took 45 seconds to load the first time):
https://youtu.be/PwjUSbWKU-U

I moved the map a bit, closed the app and opened it again (I waited four minutes and gave up):
https://youtu.be/RuH9JCVXTbo

How to Reproduce
Open the app and scroll to a location which has no cached map.

Versions affected
17

The map is also pretty outdated, as pointed out here:
#1700

[peternewman]

I'd agree with @RubenKelevra it does feel like it's got slower recently.

[westnordost]

cc @Akasch

[Akasch]

At the moment the region 6/34/22 (https://a.tile.openstreetmap.org/6/34/22.png, Munich and most of Austria) is overloaded. Because of the timeouts the server is getting more and more requests and can handle them even less. I try to find some time later Today or tomorrow to get it back to normal.

[peternewman]

At the moment the region 6/34/22 (https://a.tile.openstreetmap.org/6/34/22.png, Munich and most of Austria) is overloaded. Because of the timeouts the server is getting more and more requests and can handle them even less. I try to find some time later Today or tomorrow to get it back to normal.

I'm looking at https://a.tile.openstreetmap.org/5/15/10.png @Akasch (sorry I should have clarified location before). Should that be having the same issues?

[Akasch]

There I do not see a high load, but as it is on the same physical server, it could explain why it is slow

[Akasch]

At the moment I generate the tiles which are often getting timeouts in the Austria region, and will serve them as static files. This should make the whole process faster again and fix the problems in this region.

For the interested: Code to automate the pre generation of complex tiles is in work at Map-Data/tileserver-mapping#1

[Akasch]

The slow tiles of 6/34/22 are now served pre generated as static files from the web-server. Should be much better now.

[westnordost]

Turns out the app did not cache anything anymore. Will be fixed in next version.

[RubenKelevra]

@westnordost thanks for the fast fix!

You're killing it :)

[RubenKelevra]

The slow tiles of 6/34/22 are now served pre generated as static files from the web-server. Should be much better now.

Have a look at this comment, you can automate the caching and updating with some nginx cache settings.

Nginx will serve outdated tiles and update them in the background, instead of waiting for the newly generated tile from the background - which might run in a timeout for the client.

This should give a good performance boost :)

#1700 (comment)