Currently, every desktop environment got an option that disables the desktop effects when they're running a fullscreen window, such as OpenGL games, for improving noticeably the performance.
This is very useful for gamers, and switching manually the compositor off every time isn't a great idea especially for newbies. Xfwm4 improved a lot in all those years, and that little feature will make it the best multi-purpose window manager since it's light and is also can offer tear-free compositing but that's imo a annoying problem. Compiz has this, like marco, muffin and mutter.
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