Lately I have run into a really big problem. Stomach churning, throw the rift off my head, reach for a bucket, awful lag and it has nothing to do with the frame rate.
There is no choppyness associated with this lag, if anything head tracking goes "extra smooth". For instance, if you roll or nod your head, the camera lags behind, to the point where you can almost get the camera to stay stationary why your are rolling/nodding (and if you do it to much.. reaching for a bucket).
The two times I have noticed it was 1) I had loads of particles on screen, forward rendering. The weird part is, I had equal amounts of particles in all direction, but the horrible lag only occurred when I looked in one direction. If anything, there where less particles where the lag happens...
2) Point light, deferred lighting. Lots of calculations here, lots of shadows being thrown around, but zero drop in frame rate, just this horrible smooth lag.
Is it just me?
Any help fixing this, or at least ways to avoid it would be greatly appreciated!
edited to make the subject line more relevant to the topic