I am also using a clean install of 5.0 on XP. I am not having the severe slowdown that Fisher is seeing, but it is definitely slower to compile than the 4.1 version. Side-by-side comparison shows the 5.0 IDE to be 30% to 50% slower to compile. With small projects this goes up to 200% to 300% due to the pre and post housekeeping "generating markers" of the 5.0 build process. Unchecking tthe C++ indexer boxes in the application and syslib properties does not seem to speed things up at all. Maybe it is not really being turned off? What is this generating markers business anyway?