Linked by Eugenia Loli on Tue 11th Nov 2003 21:43 UTC, submitted by John

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Which is the rather antequated client-side expose handling model. Rayiner Hashem will most likely disagree that this method is inherently superior, but it's certainly my belief that this is the way all modern windowing systems should go. Windows uses this model, but for transparent windows only. OS X uses shared memory raster buffers between client and server and consequently all expose events are handled server side.
I hope to see these changes committed back into the main XFree86 tree, and I also hope that toolkits will begin to give compile-time flags to disable needless client-side double buffering which was a hack to increase performance of the client side expose handling model.