>>981186>my computer started to run really slow. Like it would take a couple of minutes to start up Firefox>my CPU shows 63.5 degreesReddit is full of shit. CPUs do this when the cooler is not making good contact with the CPU die; it's got nothing to do with dust.
The CPU has additional sensors you have no access to, that pause and depower it whenever a region of the CPU gets dangerously hot. For you, these are going off ALL THE TIME, which is why the average temperature is quite low: the CPU is not actually running often enough for the average temperature as-measured-by-the-motherboard to get particularly high.
What you need to do is read the instructions for your heatsink, take it off, and put it back on properly.