Hello, My computer starts lagging after i watch longer videos on youtube. The same problem occurs with gaming, initially the game works fine but starts lagging 10 mins into the game.
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My initial thought is overheating leading to throttling. Can you list your full system specs? Extra credit if you can run your computer under load for a while and check the temps when it starts to lag.
As subasteve says. If it was only on-line videos lagging I'd suspect your internet connection but if games lag too, could be other problems. Also, what are your specs?