Framerate problems with shaders on pretty powerful specs

[NaN]

I can not replicate the fps issue on my ati machine(noshader 500-700fps, shader 100-250fps paulricard88/XS).

The problem with the lights is known(data issue) just hasn't been fixed yet.

Can you please post your C:\Users\<user>\Documents\VDrift\log.txt from a test run? I'll add the issues to the tracker.

You can try to run the game with the following parameters to gather some more data: -dumpfps -profiling

And maybe try the old renderer with: -gl2