I have some pretty cheap network hardware here.. and i did a test to see how fastmy wired network was and it was something like 0.7 ms return, so you compare 0.35 ms to say 8ms for an LCD and it's negligible. mice/keyboard/screens are more likely to add latency than networking, eg the difference between my wireless [edit: MX Revolution not G7] and my razer deathadder, and the difference between a Dell 24" (16ms) and my other 17" screens (8ms i think) is more noticable than any network latency here, on either of my KM's. Actually I think my new one can still be tweaked a little more. Not all KM's are equal in latency, and I can't comment on Synergy, but tight network code should be very quick.