1200479 - [e10s] Scrolling on Treeherder is very slow on OSX 10.10.5 with 43.0a1 (2015-08-31) with e10s enabled

Status: RESOLVED DUPLICATE of bug 1200158

(Firefox :: General, defect, P2)

Description

[Jonathan French (:jfrench)]

Scrolling Treeherder using Nightly 43.0a1 (2015-08-31) with e10s enabled is very slow for me. I'm curious if anyone else can reproduce it.

If I disable e10s in the preferences, performance appears to be fine and reasonably snappy to scroll the default loaded Treeherder resultsets.

Nightly was fine up until I think 08-28 or 08-29. But - I did upgrade from 10.10.3 to 10.10.5 on Saturday, just prior to this regression. Could it be related?

Configuration:
MacBook Pro 2.4Ghz, 16GB, NVIDIA GeForce GT 750M 2048 MB
OSX Yosemite 10.10.5 (14F27)

Steps to reproduce:
o run default Nightly, clean cache, no bookmarks, etc (I'm running via Profile manager, but it's a clean profile)
o navigate to https://treeherder.mozilla.org
o try to scroll the main window view

Expected:
o A quick and interactive scroll.

Observed:
o The scroll bar is very sluggish and barely moves in response to mouse input. The page movement itself is similarly slow.

A quick check of other general websites and services, appear to be 'fine' under e10s in the sense they don't have obvious scrolling issues. Apologies if I've entered the bug against the incorrect component :)