Re: How to improve perimeter D?
In terms of ability, quickness, footspeed, and strength are the most important. You also might want a decent vertical in order to contest shots that is if you are a shorter player like a Dwyane Wade.
The best thing you can do though is to give it your all though.
Defenders generally have the biggest heart and give the most effort. That's why players like T-Mac and VC sucked at it.