I have a Lenovo laptop and my internet connection is slow. But when I use the same Wi-Fi from other laptops or pc they are quick, so it's not the connection's problem. Also when I play gaes, both installed and online, it'sextremely slow and I can't even play…
Could it be my graphic card's fault?
Slow gaming/Internet buffering?
Djd
Open your task manager when your are playing the game on your laptop and check to see what resources are being used. The "processes" and "performance" tabs are useful for this. Odds are some hardware is maxed and you will be able to see what is responsible. 
Adam