Are you experiencing laggy gameplay, choppy frames and sound, crackling popcorn like speaker noises, and cant figure out what the problem with APB is?!
After a week of studying what could possibly be wrong, from reading every post on Realtek issues to updating directx and all the drivers on my computer... this game really made a mess for a lot of people... I found the solution to these problems. (Worked for me at least)
Here are the steps that got me from 10FPS and crackling sound to 75FPS + on Maximum Graphics settings.