windowed vsync

I play a Flash game called Transformice, and for some reason, it stutters on my 144 Hz monitor. I used to play without any problems in the past using the same monitor and even worse specs (not that it should matter for a 2D Flash game). Surprisingly, when I set my monitor's refresh rate to 120...

Does traditional windowed mode v-sync have way less input lag than the traditional v-sync? Will you always get windowed mode v-sync no matter what, and what happens when you enable v-sync in windowed mode? Does windowed v-sync get overridden? Would it technically be more beneficial to play in...