272801 - Scrolling w/thumb (scrollbar) uses 100% of CPU time

Status: RESOLVED DUPLICATE of bug 141710

(Firefox :: General, defect)

Description

[bbraumoeller]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0

Any time I use the "thumb" (the blue slider dealie in the vertical scroll bar
along the right-hand side of the page), I get a spike to 100% CPU usage.  The
spike lasts as long as I hold down the mouse button, whether or not I'm actually
moving the mouse.

Reproducible: Always
Steps to Reproduce:
1. Run Activity Monitor and select Show CPU Usage.
2. Run Firefox.
3. Scroll up and down a page.  Watch the CPU meter.

Actual Results:  
CPU meter maxes out as long as mouse button is pushed.  After doing this for a
while, fan kicks in.

Expected Results:  
Use much less CPU.  Have never seen this in a browser before, incl. Camino,
Safari, IE.

Comment 1

[Jo Hermans]

*** This bug has been marked as a duplicate of 141710 ***

Comment 2

[Jeroen van der Ham]

I am not sure whether this is really a duplicate of that bug. That bug deals
with clicking *within* the page itself, not with the scrollbar.

I also cannot reproduce it myself.

Comment 3

[bbraumoeller]

Original reporter here... can duplicate at will on 500 MHz G4 TiBook, cannot
replicate on dual 2GHz Power Mac.