Some of the Seneca turbos have IO-360's in them and are not high performance as they have 200 hp a side. Seminoles were specifically designed as trainers, so are not high performance either. It's silly when you think about it because both airplanes are faster than many high performance singles. I always thought the designation should be based on speed, not power.

My high performance checkout consisted of zero ground time with two trips around the pattern. On the first trip my instructor goes, come on give her some gas. On the second trip I did a little better and he goes, yeehaw here's your signoff. Evidently he wasn't a big fan of it either.