Lags without high ping

So here I am again with the same problem as some months ago, my ping is 50/51 and it lags as if I had 1K ms maybe. So far I've tried to reboot my box / pc / game , repair client, get back to old client, flush dns and nothing works. My internet works fine for everything else but once in game its extremely laggy and not possible to play , I think it lags every 10/15 secs, sometimes for few ms or sometimes 3/4 seconds. I'm totally out of solution, if someone else have this problem and eventually found a way to resolve, I'd love to hear it. Thx
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