Ok, I managed to build libx11 without xcb: http://users.tkk.fi/~tjaalton/dpkg/
at least on my laptop (savage) the performance is much improved. -- Sluggish rendering since xorg 7.2 update https://launchpad.net/bugs/88815 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
