I want DELETE all ADDONS from my L4D² because it causing usless multiple loadings at game start making the game instable and laggy while loading. I have only 2 addons installed (Tank challenge and SURIVORS1 skins) and that's totally boring to wait -at every game start- infinite loading datas (sometimes 2 min!!!) . VALVE should allow to tick OFF all addons at start, and we should tick ON the desirated ones if we need it, that's totally UNBELIEVABLE.
I found no files in the folder "addons" of my game installation, and nothing allow to delete anything in the in game menu.