[_mtr]

I've put about 12 hours in on my late 2013 13" mbp. For a decently sized-city (10k+), there aren't noticeable performance issues at full-screen and mostly 'medium' display options. Your fans will get a workout and you get about 30 minutes of battery life off the charger, though.

[TylerE]

10k is barely scratching the surface. 50k is where it gets interesting.