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Serious performance issue when windows overlap with Quartz Composer or OpenGL windows

Subject: Serious performance issue when windows overlap with Quartz Composer or OpenGL windows
From: David Niemeijer <email@hidden>
Date: Sat, 28 May 2005 20:55:18 +0200
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi,

I have been noticing that my G5 DP 2.5 Ghz slows down to extremes when I have a Quartz Composer Viewer window open and another window partly overlaps it. The Finder feels like 10.0 on a G3 266Mhz (or actually worse) in such cases. I also see it with certain game windows, for example, when Kill Monty (http://www.freeverse.com/killmonty/) is used in windowed mode. Even when the game is not being played (it is showing the high scores page) and a Finder window partly overlaps my machine slows down. On 10.3.8 doing the exact same has no negative impact on speed.

I have filed a bug rdar://4133576 including Shark profiles, Spin Control detected hangs and a short screen movie.

Note that I did not fiddle with any settings this is a clean 10.4 install updated to 10.4.1

david.
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