https://us.battle.net/account/download/ I know you can play for free up to like level 20 but there is an in game latency tracker (ie network status) and for the record currently I'm sitting at 78 ms and I am good with that, but It may change over night for no particular reason....
The other reason why the first latency test figure is misleading comes back to the issue of ghosting. While you can argue the merits of fast refresh rates, what your eyes see when there’s fast motion on a display with a fast refresh rate and slow response time is still an image that’...