Today after I installed the first time supreme commander and tried it out on the first level I was getting about 60fps on average, I had planned to make a clean installation today and so I did (thought i'd yield even better results aswell), to my surprise I've formatted and installed windows XP twice and Vista once and on XP I keep getting the same results now (about 30-40fps), so I opened task manager and found out that only Core#1 was in use, on vista on the other hand it worked just fine (as far as the use of both cores, but I have a series of issues with vista drivers so that's not a viable option for the time being).
I just reinstalled XP and keep getting the same results as before (using only one core), and the only things I have installed are the motherboard drivers and both service packs.
I do recall installing a microsoft dual-core patch before (that was on my original installation) and changing something in the registry from a guide in gamespot, and I tried redoing what the guide said but it didn't work.
Well you can always try and uninstall that patch and give the game a try because i have heard mixed opinions about tha patch, for some people it did the opposite. Disabled the 2nd core instead of enable it.
I'm having the same kind of problem, though a bit different.
Running SupCom on a quad core, and to begin with, it worked fine! No lag ever, at all. Now I'm playing it, and it's only using 1 core, and lagging to hell and back. It will go for a few minutes working fine, then my core will spike to 100% usage for 20-30 seconds (Sometimes more) And then back down to playing smoothly. It's so weird! Anyone else having this issue and/or know of a solution?
Intel Q6600 @ 2.4
2 gigs of 4-4-4-12 timing RAM (Forget the brand)
eVGA GeForce 8800GT