The Problem
As you may know, currently the lighting is very inefficient. That is, adding more lights adds significant performance hit. Also, visually the lighting is limited as it doesn't have indirect lighting calculation (that is, there is no GI, adding a lamp to ceiling that faces downwards...
So a while ago I experience my first crash in the game. The game just froze, then exited. I wanted to keep playing so I decided to open it again. But during loading screen it got very laggy until it froze my computer forcing me to hard-reboot. Next time similar crash happened I looked at system...
I am having an issue where having light sources in the hand can cause very serious FPS drops. It's consistent across all my testing, but I recall it not being the case a while ago.
Basically I usually get roughly 60-80 FPS in the game. In a base populated with lots of lights it can drop as low...