In 2000, I don't think many open source X clients (typically Linux stuff) used xshm. Not using X any more, I can't really comment on the current scene. But apar

In 2000, I don't think many open source X clients (typically Linux stuff) used xshm. Not using X any more, I can't really comment on the current scene. But apart from things like MAME and vlc, what app needs it? And web browsers, of course. (Accelerating OpenGL in hardware but displaying in an X11 window is a different question.)