That is application of the formula

Pre-work time + pack up time + send time + unpack time + work time + pack up time + send time + unpack time + post-work time.

All remote work has these properties. Even something 'simple' like a remote REST call. If 'remote work time' plus all that other stuff is less than your local calls then it is time wise worth sending it remote. If not local CPU would win.

That in many cases right now the GPU is 'winning' that race.