Better to type these in-game or else the confirmation box will pop up each time you execute the commands that need resetgl.
Then add these options to your launcher:
Finally, turn down your resolution.
[SELECT ALL] Code:
maxfps 0
texreduce -1
dynlight 0
dynshadow 0
lighterror 100
gibnum 0
blood 0
hudgun 0
vsync 0
[SELECT ALL] Code:
-b16 -z24