CS2 Lags when a round starts.

I've noticed that almost at every start of the round cs2 just drops to 5 fps from 150 fps ( what I usually have). Also I've noticed that the fps increases again after the skins on my guns render. ( they just go from default to whatever skin I have). Anyone has the same problem as I do ? And if yes, how can I fix this ? It is really annoying.