Agree with Alan. I look at the high/low RPM and temps basically and then download to the laptop to analyze traces.
A single data set is somewhat useless unless you were actively trying different racing lines or something during the session, but once you make a change and compare that data to the original set, you can see where you gained or lost time with a gear change for example, or you can see if you were able to accelerate better off a corner if you made a handling change to free the kart up.
The first-glance data like RPMs and temp give you a good initial idea of where your engine is performing. Most of the time you’ll have an RPM range and a temp window you’re shooting for where your engine builder knows the engine will be performing its best. That first-glance data can tell you quickly whether or not you’re in those ranges, but analyzing it on the computer can show you why you are or are not in the ranges.