Every now and then when I start up fs9 and show the fps counter, it reads from 200 to 400 fps and sometimes even higher than that. At the same time, the sim itself is craaawling forward totally unusable. The real fps is probably less than 1 fps. I've had this problem several years and with totally different systems - not a single hardware component in common. The add-ons of course are to a large extent the same but I can have this issue immediately having started the sim at a default scenery with default cessna and no weather add-on started. It doesn't help that I restart the sim, I have to reboot and sometimes the problem will show itself immediately again after the reboot.Has anyone else experienced this strange phenomenon? As I said, with totally different systems and with Windows XP as well as Windows 7 64 bit. I am at a total loss!At one point I was able to pinpoint the problem to a Goflight driver for their MCP (while I do have other Goflight stuff, not that specific unit) that caused a 100% load on the CPU, but isn't the culprit now.

Have you tried limiting the frame rate to 60 for example?

Have you tried limiting the frame rate to 60 for example?

Yes, I just experienced the issue and I had limited the fps to 40. Of course, now it didn't peak at 400 fps (or in that area) but it behaved exactly the same way, that is like 1 fps. I am sure that if I had the limiter to unlimited, it would have read those exaggerated values again.

that' s weird. If you monitor your system, do you see some process / service hogging your resources (CPU, memory, etc..)? Has it happened in different windows installs? did it start recently or it's always been like that?