Quote from DrywallDreamsThe whole "64 tick... is a joke..." complaint is people misunderstanding the issue entirely. Valve servers suffer more from plain poor performance plus sync bugs, but this update fixed the sync issues. Of course 128 ticks/sec will still be better, as much as the 7.81ms between ticks helps, which isn't much. If you've ever watched a 120hz strobe, it's apparent how little it would help.
Uhh.. if your command (from mouse/keyboard) is getting "in between" the ticks in 64, then it sucks and it's not registered. 128 makes it less likely to happen. It's small time, but small things matter in vidya games like CSGO. Source just works weird with 128 tick on other stuff, like doors and jumping/physics (you can jump easily higher with 128 than 64).