I recently decided to try out the new windows 7 in 64 bit. I had previously tried the beta version which was actually pretty good, but it seems since then they have added a ton of useless crap!
After installing Arma 2, at first I didn't notice much difference in performance. The fps was a little lower for sure, but I thought that would be in exchange for smoother gameplay.
How wrong I was! After carefully evaluating the performance and running several scenarios, it is apparent that on Windows 7 Ultimate 64 bit, your system will be needlessly wasted.
The game was constantly stuttering, always having to load when I looked around etc. I recrated a large AI battle scene again, and rather than getting a nice 18-22fps as before, I was left with a shoddy 2-8fps.
I examined the processes on my pc, and after comparing with my newly reinstalled XP, I am amazed at all the crap going on in Windows 7! In XP my average commit charge never generally goes above 100m, and my cpu usage is 0%. In XP after a fresh install, I just about have 20 processes running. On windows 7...
The commit charge is always above 800m! To add to that, the CPU usage lingers at 3%. The process count is over double, with over 50 active processes! This may not seem bad, but my god the performance decrease is horrible.
Just thought I would share that little info, maybe it can help out some people who are still unsure of how fast windows 7 is with Arma 2. I will be sticking to XP for a long time!