Ok, this one's causing me nightmares... :bored: I have this map I'm working on. When I launch the map right after starting the game, I get more or less an average 150 FPS, which I consider good given my config. However, if I load any other map (especially a big one, say hydro or meridian...), then reload my map, suddenly I'm down to 30 fps (unacceptable), while looking exactly at the same place as before... ? This seems to wear off over time or if I mess up enough with the camera in spectator mode. FPS then return to their normal value. Note that my fps are still affected by what I'm looking at, so for exampe staring at a wall in a closed room would net me 300 fps, while going outside the map and looking at it in its entirety would give me about 15 fps... This problem didn't occur on the previous version of my map. Considering what has changed (mostly texturing and lighting), I tried to remove various stuff to see if it was related. removing water and returning to dev textures changed nothing but removing all lights except the light_env seems to get rid of the problem... Though that's not really an acceptable solution. Not running vrad and having the map fullbright also prevents this fps drop. Does anyone have a clue what could have gone wrong with my map ?