After a while there is a FPS drop for 3-4 sec. (using 640x480@60FPS)
I noticed this occur not only in games, but even in the test application from CLEye Test App. If you drive smoothly head around, after a certain time (40-60 sec) FPS drop 3-4 seconds. Have not seen this on version 4x.
Use PS3 eye + Freetrack playing Warthunder.