My FS for some reason has started going really jerky.It was fine yesterday morning, but suddenly I'm getting really low frame-rates, even after a reset. Other games seem fine.Thing is, I have a feeling it may be something to do with my dual-core AMD. If I run the task manager, the two graphs showing the 2 cores show one at 100% and the other pretty much at 0%. My Winbar CPU monitor says the CPU is at 50%.Anyone have any idea what's happened?My system:AMD X2 4400512MB X1900XT1024MB DDR400 Dual ChannelWindows XP 32-bit

>>>the two graphs showing the 2 cores show one at 100% and the other pretty much at 0%. Thats sort of normal with dual-core since fs9 wasn't coded to use two cores. However 1 core running at 100%?? most of us here on the board get around 50% load what your Winbar stateshttp://forums.avsim.net/dcboard.php?az=sho...16554&mode=fullHave you checked your drive for spy/adware and virus check? and when is the last time you have done a defrag?. I assume when you run fs you close unused background running programs?

Its a totally clean reinstall. I reformatted on Saturday because of a virus. Anti-virus, firewall and anti-spyware are now completely up-to-date.Plus the CPU graph goes down to pretty much 0% when I close FS.

Ok so if its a clean install have you correctly installed all the drivers specially your chipset drivers?. Checked Microsoft KB896296 Dual-core hotfix?. Checked directx?

Yep - chipset drivers, latest Catalyst drivers, got the hotfix.The thing is, every single other game seems to be fine - its just FS.

After a bit of experimentation, and reinstalling a few drivers, it works *sometimes*. After I reinstalled the graphics driver last night and reset it worked fine, but when I got up this morning and turned on, it was being jerky again. :(

This looks like an overheating issue to me...The weather has been unusually hot recently... I'd check the cooling set up you have (try speedfan) and check the temperatures of CPU and chipset in particular... Oh and check the graphics temps...Perhaps a long shot, but jerkiness in game play is sometimes attributable to heat...Just my guessAndrew

Don't think its overheating as the card is only around 58-60 degrees C. Plus as I've said, other games work fine, a lot of them much more demanding than FS.I've installed the Omega drivers and that seems to have fixed it (for now).