407180 - [10.5] OSX performance: scrolling "chunkier" on Leopard than Tiger

Status: RESOLVED WORKSFORME

(Core :: Widget: Cocoa, defect)

Description

[Marcia Knous [:marcia]]

Seen using Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9b2pre) Gecko/2007120604 Minefield/3.0b2pre.

STR:

1. Have the same page up on two different machines (we used a simple bugzilla page), one running Leopard and one running Tiger. Autoscrolling is pref'd on.
2. Use the touchpad to scroll the page up and down.

juanb and I observed the scrolling performance is not as good on Leopard as Tiger. We were using a PPC mac running Leopard at his desk, but I notice the same scrolling issue on my Intel MBP running Leopard and the PPC mac in the lab running Leopard (in this case I am scrolling with a mouse).  While Tiger is smooth is silk, Leopard seems to momentarily "hang" at various points, especially when sliding the bar to the top and then moving it down.

Comment 1

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

I believe that the core problem here was fixed by the fix in bug 418311 -- however, there is still a remaining issue with scrollwheel/two-finger scrolling.

Comment 2

[Darren Stone]

Related to bug 428070?  The overflow:auto property significantly degrades scrolling performance.  

Comment 3

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

Marcia, did the patch from bug 428070 help/solve this?

Comment 4

[Marcia Knous [:marcia]]

I am going to resolve this as WFM since I am no longer seeing the issue.