So assuming the logic at the server end is something like this:

pulse_start -> send_data/receive_data -> pulse_end .. PROCESS ..

and that your roundtrip to the CF server is 200ms, a pulse
(time between pulse_start/pulse_end) would have to take 200ms or
less in order for you to have a chance to miss it.

200 ms pulse time means that there are 5 pulses a second which is
clearly not the case with CF. I do not know the exact duration
but empirically i'd estimate it at 400ms, possibly more.


So, 200ms roundtrip to the server should not affect your command
inputs and you shouldn't be disadvantaged (in combat).

EDIT:

Forgot to mention that the above does not include human reaction
times so if we assume that your reaction time is 300ms (sort of optimistic and implies that you never type but use predefined macros)
then with a pulse time of 400ms you can miss commands..

When i was playing from Europe, my roundtrip to CF was, at times,
500+ milliseconds. I had to stack commands and have the battle
strategy mostly predetermined in order not to miss rounds.