Comment 10 for bug 1037411

I'm a little confused by that.

Changing from tmpRegion to screen->region () effectively meant that the entire backing framebuffer object is painted to the backbuffer, rather than a small portion of it. This is necessary because we are always using glXSwapBuffers and the backbuffer becomes invalidated upon swap.

Why would this change have anything to do with the slowdown if the slowdown still occurrs when painting from a framebuffer object is turned off as you put in the description?