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Sorry to hear that 10.2.6 doesn't offer any improvement. Nearly every 10.2.x release has mentioned fixes/improvements in OpenGL, although there hasn't been much, if any, information available (even in developer Tech Notes) as to what was changed. I e-mailed a complaint to Apple's Tech Support people for one of these updates where the announcement of the release referred to fixes/improvements in OpenGL, but the Knowledge Base article describing the release (linked to from the release announcement and/or download page) did not even contain the string "OpenGL".
We've opened a developer technical support incident (an official request for support) with Apple on this problem, although we have not heard back from them for a couple of weeks now. When we have something useful to report, we'll try to communicate it here in a timely fashion.
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