pitiful data speeds, don't know why

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http://forums.androidcentral.com – I've noticed over the last month or two my data speeds are not what they use to be or should be at this point. I've tried flashing radios which didn't help and right now I'm running with aokp ROM. I've ran speed tests against the Razer and iPhone 5 that were 3ft away, I even tried switching seats. My coworkers sporting around 10 to 16mb/s and the nexus.... brace your selves, 520kb/s down on 4g with good reception and all our service was verizon. I do get good speeds once in awhile but it rarely lasts long. I had no other apps downloading anything, I've had the same results after factory (HowTos)