Hi allI've just upgraded from Vista Home Premium to Windows 7 Ultimate. FSX performance has gone through the floor, on Vista I got really good FPS with a little stuttering every now and again. Now using Windows 7 the FPS jumps from 3 to 191 to 89 to 9 to 120, it's totally unflyable, and much much worse than it was using Vista.This is using the default ultralight at Friday Harbour with low settings for the graphics.When installing W7 I did a clean install, then installed the latest drivers, then FSX with SP1 and SP2.Totally confused as to why this is happening. I had read W7 performance should be slightly better. If anyone has any ideas of things I can check it would be much appreciated.I've got a Dell SPX Studio, core i7 @ 2.8 GHz with 8GB RAM, GT240 video card. I know these are not good specs for FSX but as I say what was OK using Vista is now terrible using W7.If all else fails I'll have to drag my old P4 out of the cupboard and fly FS9 in the 2D pit with no scenery. NoooooooooNiall

Hi allI've just upgraded from Vista Home Premium to Windows 7 Ultimate. FSX performance has gone through the floor, on Vista I got really good FPS with a little stuttering every now and again. Now using Windows 7 the FPS jumps from 3 to 191 to 89 to 9 to 120, it's totally unflyable, and much much worse than it was using Vista.This is using the default ultralight at Friday Harbour with low settings for the graphics.When installing W7 I did a clean install, then installed the latest drivers, then FSX with SP1 and SP2.Totally confused as to why this is happening. I had read W7 performance should be slightly better. If anyone has any ideas of things I can check it would be much appreciated.I've got a Dell SPX Studio, core i7 @ 2.8 GHz with 8GB RAM, GT240 video card. I know these are not good specs for FSX but as I say what was OK using Vista is now terrible using W7.If all else fails I'll have to drag my old P4 out of the cupboard and fly FS9 in the 2D pit with no scenery. NoooooooooNiall

You need to defrag after installing Windows 7 (unless you have an SSD) and FSX and any addon. For some reason, files are thrown all over the harddrive. Best regards,Jim

Thanks JimI'll do a defrag. Looks like the problem was a faulty video card. I replaced the Nvidia card with the original AMD one and all seems to be ok. PC isn't crashing anymore either.Niall