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Why Mouse cursor is so dangerous for performance?

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It there anybody can explain me why the presence of mouse cursor in OpenGL windows break speed.

For example in XBench or in GioFX OpenMark.

When I try full featured hardware OpenGL the presence of cursor makes me delays up to seconds for each refresh.

What is the influence?

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because quartz composer have to render in-frame scene first than make texture from it than compose new scene with cursor dropping shadow on textured plane ) than show it to you

otherwise (without cursor) it probably run pure HW render in window

I think so at least

try to profile it

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