I don't know much about it at all. I just know that it effects the way samples are played back in the daw. There's also issues with this if you have a massive project using many many plugins and your system doesn't have enough RAM, and it can't handle the CPU load. It's latency, and if you've hit your system's processing peak, it could be your problem. But, like I said, I'm not certain.
Hope that helps!