sometimes block is bugged, you see your char blocking but it's not. If you are on pc there is an addon called "Am I Blocking?" that tells you if you are really blocking or not
Probably, also it you're using a Wireless Mouse, I would probably plug it in for less latency
Probably, also it you're using a Wireless Mouse, I would probably plug it in for less latency
Maybe. But, USB receiver wireless mice are only likely to introduce 0-2ms of additional input latency. Which is not nothing but is very very small relative to, for example, our personal reaction time.