The irony is that it my be less expensive to have a background in a window as it
gets cached in the video card memory compared to a background blank redraw over
the network for instance.
XShmPutImage is about ten times faster than XShmGetImage because the hardware is optimized to write and not read so you want to cache information in main memory.
This gives you an idea of what his talk was like. It was technical and kind of
hard to summarize. You can look at Raster's presentation (in Staroffice format)
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