When gaming (any game really, but it's the most detrimental in DOTA2 - you guys know what I'm talking about) all characters on the screen will run in place for one to two seconds and then resume whatever it was they were doing. There is no FPS loss. Essentially, it's a huge ping spike, then everything is back to normal. There is no rhyme or reason to when this happens. Sometimes (if I'm lucky) it'll go five minutes without, sometimes every 10 seconds, and sometimes every 15 - 130 seconds.