How to fix hitching/lag spikes/stutters in your Left 4 Dead 2, probably, quick tutorial - zoeyglobe
Channel: Novimatrem / zoeyglobe 💚
Date: 2023-05-30

Hope it helps!
It worked for me, finally fixing my game after a long time of not being able to play smoothly. A day of non-stop research, testing, and tweaking lead me to discover this. If it doesn't help for you, like it did for me, then simply remove it from your launch options and your game will go back to normal.

Once again, that launch option to copy is: -threads 1