I used to have terrible lag spikes, then I started using WTFast... now I won't play without it. There's a lot of issues with connectivity out there, some are with individual ISPs, but in the Eastern US it's one of the Main backbones *cough*Level3*cough* that causes a lot of issues. If you can't change your ISP, or if it's an outgoing connection from your ISP to a backbone, there's nothing much you can directly do. Some people have success with GPNs (like me), others don't. I'd still suggest giving it a try... might help. Of course, sadly you'll have to ignore this if you're a PS3/4 user... no real way to use those GPNs on consoles that I'm aware of.