Response time on a monitor

[Skaramush]

Thanks sorry i missed it first time round

[Jake_UK]

the cumulative effect of things not quite changing quick enough is discernible as ghosting, smudging and blurring.

Agreed, my point is that when talking about such low numbers (2 vs 5 or 8ms for example (or pretty much anything <15ms as per your later post seems to say)) is not going to make any difference in reality and the OP shouldn't worry about it too much - see Cat5's post for example.

Talking of reality, don't get me started on flashbangs and exactly how long that would really affect what you see (or more specifically don't!)... but that's down to game designers and (lack of) realism.