Looking at your speed trace only, look for a smooth line on accelerating out of a turn. Any steps in the trace on acceleration could mean that the kart was over driven into the turn and now that you are past the apex for the turn you are still making steering corrections when you should be concentrating on accelerating towards the next turn.
Load multiple laps and look for the corners that show the most inconsistences. This also can be done with the Split Report and looking at the Std Deviation row. The higher the number, the greater inconsistences.