I just upgraded my computer to a Intel Q9300 (quad core) and 4gb of ram. And LFS has been running at 3-4fps ever since. But the first time it ran (i reinstalled it for scratch) it didn't have any problems.
I'm running Vista 64bit SP1 (my old system was Vista 32bit SP1)
I'm running Vista 64bit SP1 (my old system was Vista 32bit SP1)