Why is UE4 running slow?

I’m going to go ahead and assume you’re Staff since you said “we’ve released”

I was in beta!

I’m running Windows 8.1 Pro 64-bit

Specs:

RAM: 8GB DDR3
Processor: i7-3770 Quad Core @3.9Ghz
Graphics Card (ick, worst part of my computer) GT 630 2-GDDR3

Thanks!