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I'm having trouble with MSFS2004, when I switch to virtual cockpit mode the view stutters a lot (feels like rate of refresh for trackir drops to 1-3 times per second).

At the same time, tracking window shows that it works fine, and other applications don't seem to be affected (i.e. PF works fine).

Couldn't find the reason yet.

Everything listed in FAQ doesn't help (ActiveCamera head latency disabled).

Any thoughts?

Any additional add-ons installed?

Yes, I've got some scenery.
Tryed to decrease level of detail (to absolute minimum), it didn't work.

Didn't tryed to remove additional scenery, yet.

Which titles?

Generally I see a drop in framerates as an indication of TrackIR possibly having a conflict with an add-on. I have seen some add-ons have a head latency setting, which can effect the TrackIR unit.

Also check your video card setting, and see if you have a v-sync setting. If you do, make sure that it is enabled.