Finally had a chance to test this out. The good news is: Same FPS as what I get on Trunk.
So, in the F3 lab, is the mouse attached to some form of a spotlight that moves left/right as the mouse goes up/down?
I see there are some commandline settings, but as I haven't been arsed to run wxLauncher in ages, what are they and their values?
Possibly asset related as I can't seem to find any other model in the 2014 MediaVP's that does this, but check out the domes of the Charybdis in the F3 lab for some unusual behaviour.
It's already been pointed out (I think) as 'known' but the env mapping is really kind of strong under the same light settings compared to trunk.