1235839 - Slow scrolling on http://deeplearning.net/reading-list/

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Marco Castelluccio [:marco]]

The animation in "tag cloud" on the right causes scrolling to be really slow.

Comment 1

[Marco Castelluccio [:marco]]

Attachment: profile.7z

Comment 2

[Mason Chang [Inactive] [:mchang]]

This profile seems to be in a .bin format? What kind of profiler were you using with the attached profile? Thanks!

Comment 3

[Marco Castelluccio [:marco]]

The Gecko Profiler add-on.

Comment 4

[Mason Chang [Inactive] [:mchang]]

From the profiles, I see super long 500+ms times to do XRender::Sync, _XSEND and XUnlockDisplay. I know we're planning to reduce our dependence on XRender, which should help this test case.

Comment 5

[Marco Castelluccio [:marco]]

It's still slow, I can grab another profile (although bug 1241832 caused bug 1247935, so I don't know if it'll stick).

Comment 6

[Marco Castelluccio [:marco]]

This is now fixed (both with gfx.xrender.enabled set to true or false), I wonder if this was fixed by the same fix for bug 1247935.

Comment 7

[Lee Salzman [:lsalzman]]

(In reply to Marco Castelluccio [:marco] from comment #6)
> This is now fixed (both with gfx.xrender.enabled set to true or false), I
> wonder if this was fixed by the same fix for bug 1247935.

That makes sense, yes. As Mason noted, a lot of the profile was spent in XSync waiting for stuff to be drawn. So if there was somehow contention for the connection to the X display, the changes I made in bug 1247935 would massively reduce that contention, since it no longer uses the XSync mechanism at all.