Excellent work Gé!
I ran some rosperf tests for your new code, the results are at http://waxdragon.homeip.net/~ford/reactos/rosperf/ .
Check the rosperf_dibgen* files, there is a debug and a release run under qemu 0.7.0 and a debug run under vmware 4.5.2 (using VBE, of course).
WD