Aurora 50 slowdown

[Ezh]

Does someone experiences a slowdown in Aurora 50 UI after some time of up-time? I'm on Windows 10.

Started right from 50 installing, returned to 49 and no problem.

[dbcooper.dk]

Yep. It's on Nightly too.

Might be triggered by youtube.

[Ezh]

Is there a bug for it?

[dbcooper.dk]

Not that I know of.

[Ezh]

Does someone knows the bug? It's not so good to fill a new bug and get a duplicate.

[dbcooper.dk]

Seems to be a bug filed here:

https://bugzilla.mozilla.org/show_bug.cgi?id=1295214

[dbcooper.dk]

And an Apple specific bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1295217

[Ezh]

https://bugzilla.mozilla.org/show_bug.cgi?id=1294653

I also made a bug.

[dbcooper.dk]

Thanks for filing the bug.

[dbcooper.dk]

Here are some probably/possibly related bugs, some of which include attempts to find the regression:

https://bugzilla.mozilla.org/show_bug.cgi?id=1292145
https://bugzilla.mozilla.org/show_bug.cgi?id=1293127
https://bugzilla.mozilla.org/show_bug.cgi?id=1294700
https://bugzilla.mozilla.org/show_bug.cgi?id=1292722
https://bugzilla.mozilla.org/show_bug.cgi?id=1292521
https://bugzilla.mozilla.org/show_bug.cgi?id=1294653

[dbcooper.dk]

Possible regression:

https://bugzilla.mozilla.org/show_bug.cgi?id=1294953

I spend some time with nightly builds and mozreggression tool which is great by
the way. Bisecting on those massive slow downs is hard because they starts
after some time depending on browser usage and I haven't managed to produce
easy steps to reproduce the issue (with almost not responsive browser) fast.
But I have found steps to quickly diagnose micro shuttering during scrolling on
very big site. I spend quite some time to actually find the patch which broke
it. I believe this is the same issue actually which gets more significant over
time.

Long story short, this commit is responsible for regression.

https://hg.mozilla.org/mozilla-central/ ... ca328cb3ec

And it seems like it is already being worked on in Bug 1295214.

I will do some more testing to be sure and mark this bug report as a duplicate
tomorrow.