Rustdoc is slow

[compiler-errors]

probably due to the AutoTraitFinder

https://perf.rust-lang.org/compare.html?start=667247db71ea18c4130dd018d060e7f09d589490&end=3cddd79d4be3c8f1e937d09ca618d192abc69373

[compiler-errors]

cc @fmease

[fmease]

Yup! 👍