Try cleaning out your computer, might be dust build up

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Dust, Reboot, Use a different Outlet, Use a different Wifi (If Poss), Close all tabs except TF2, Check how much drive storage is left, change ram order, use different sata connectors for drive, check computer stats, turn brightness down or something. 

Also try switching where you connect graphics cards (if poss) or POWER SUPPLY is not enough.

Thanks for the feedback ^-^

Try a new copy of Windows. 

Are you using Liquid cooling or air cooling? If you are using air cooling I would suggest what VintageSalad said

On 1/25/2016 at 9:59 PM, VintageSalad said:

Try cleaning out your computer, might be dust build up

If it is liquid cooling there may not be enough thermal paste between the CPU and block or the GPU and the block causing them to run much hotter than they should be and causing them to fatigue.

On 1/26/2016 at 2:11 AM, kojihirai said:

Also try switching where you connect graphics cards (if poss) or POWER SUPPLY is not enough.

I tried swapping the slot that my gpu was in, but my computer freaked out and got extremely slow. The computer is quite old so i think there must be something in the socket. I had 720p resolution so i decided to change the slot back :3 I might try and see if i can find a can of compressed air anywhere, but there is not that much dust in my system, and the only visible dust is on the fans, and still isnt much. Anyway thanks for the feedback ^-^