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

• Subject: Re: Serious performance issue when windows overlap with Quartz Composer or OpenGL windows
• From: David Niemeijer <email@hidden>
• Date: Sat, 28 May 2005 22:17:00 +0200
• Delivered-to: email@hidden
• Delivered-to: email@hidden

David,

On May 28, 2005, at 02:55 PM, David Niemeijer wrote:

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.

This is an issue on Tiger when a window overlaps an OpenGL context. It appears to be a bug in the beam sync that Tiger enables by default, because if you disable beam sync in Quartz Debug everything works fine again.

david.
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