Why is it that so many people do absolutely zero maintenance on their computers, and think that's completely normal?
Clean that bitch out at the very least. Allowing dust to build up in all the little books and crannies means it's not getting enough air flow.
It's typically common sense that when your AC isn't working well, you clean/replace the filter(s) to keep it operating at peak efficiency, and if you don't, you risk burning up fan and/or compressor motors.
Same thing with your car's cooling system. Keep that radiator grill clean of mud and dirt, or it's more likely to overheat and burn up your engine.
Why the fuck don't people think of that when it comes to their computers just blows my damn mind.
A tube of Arctic Silver thermal grease is less than 10 bucks. A can of compressed air is like 20 bucks, and will typically last for months.
Once a month, take the PC case outside, and blow out all the damn dust.
Every year or so, replace the thermal grease/paste.
"My computer runs slower and slower as times goes by!" Yeah no shit, it's trying not to burn itself up. Clean the fucker.
Both? Both. Both is good.