Lagging as hell.

Hampa, I asked something in the support thread, but answers was.... weird. Maybe you have to know that :

Each time I put ray tracing on, its lagging a lot (and NO, this isn't my comp, its a gaming pc).
But (and this is very interesting), rarely and suddenthly, the game recover 30fps when ray tracing is on. I just don't know why it is lagging but rarely, this isn't.

Same when I launch the game with the option already activated, rarely, its turn at 30fps.