Just rounding a location integer can be done in less than 10 assembly instructions. May be the time spent on that can well be compensated by transferring less data (orginally we transfer a float now we only transfer an integer).

Anyway, the point is processing this one sensetive information on server side really take little time. Maybe only several nanoseconds? The network latency is the botttleneck, not the proceesing of several bits of data.