Games start to lag after 20 minutes of playing..

[GraddzCZE]

Hi, its been two days since i always log on to my computer (win8) and play some games.. I am playing 15-25 minutes and then my CPU from 3-10% jumps to 15-40% and games are starting to lag ridiciously.. And then everything i need to do is just to LOG OUT and log back and the CPU is okay again.. It bothers me that every single 20 minutes i need to close a ingame playing and open up the game again.. Please someone help me.. I have notebook i7 i3630.. Its a gaming computer.. Now im not good at those things that computer includes, so can you please give me advise? thanks!

 

[sarthak.saswat.das]

I am starting to have the same problem, I connected a gt 1030 to my laptop through an adapter called exp gdc and during the first two weeks i was getting decent frames without any problems but now after playing for like 10mins the fps drops from 40 to 20 or sometimes 15! My specs
i5 2520m 2.5ghz
gt 1030
8gb ddr3 ram

 

[sarthak.saswat.das]

And yea the laptop is a bit overheated at that time