As with most electronics, and things in general, the higher the temp the shorter the lifespan and the lower the efficiency.
The absolute limit with immediate damage likely is 100c not sure what that is in f but it is the boiling point of water.
I think 140f is about 60c which is a safe range to be in.
ESCs are switching full current to give partial throttle snd switching losses are responsible for most of the FETs heat so counterintuitive time spent at partial throttle heats an FETs up more than time at full throttle, so you may find that going faster lowers ESC temps.
Paul Upton-Taylor, Greased Weasel Racing.
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