The problem is, there are no standalone small gl compositors (standalone = just compositor, not a combined compositor/window manager). I wouldn't want to give up on the feature-set and functionality of openbox. There's dcompmgr, but it hasn't seen development in years, and last time I tried it, its opengl mode caused a lot more CPU usage when doing simple things like moving windows around the screen.
Originally Posted by liam
Now I don't have tearing issues with my current hardware, but no idea how it would be if I had Sandy Bridge or above.