Dr Andrew C Aitchison wrote:
The server log only reports 'Offscreen Pixmaps' in the accelerated features of our G450 Matrox cards, although I'm not sure what it means. Your explanation for the slow down makes sense, however, i've reproduced this problem even with a card with 32 MB of memory.Sometimes pixmaps are stored in offscreen video memory, sometimes in system memory. Maybe you are resizing your window such that the pixmaps don't fit in video memory so the server puts some in system memory. Under ideal conditions copying from video -> video requires no CPU overhead, but system -> video copies can require CPU effort.The X server logfile often gives clues about how much video memory is available for pixmaps.
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Rafael
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