horrible lag spikes

I really need help, I'm having horrible lag spikes and it just got worse yesterday, every time i move it's like the game gets stuck for a second then i'm at a new position, and it happens almost all the game (especially at the beginning when i get out of base) now I've tried the following: -restart pc -re-installing on a different hard drive (to check if it was HDD issue) -lowering graphics to low I have 100mb/s internet and it's running smoothly, 8GB memory GTX 770 nvidia i5 4590 3.3GHz 64bit system my frame rate is constantly 60fps, it never drops...
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