https://www.pcgamer.com/how-to-keep-your-pc-dust-free/

Have you ever cracked open someone’s PC only to be horrified at the amount of dust and debris that’s taken up residence inside? It’s not a pretty sight. Worse yet, dust buildup can hamper performance. In extreme cases, those dust bunnies that sneak into a PC can even damage a system’s hardware.

A little bit of dust isn’t going to hurt things, but if left unchecked, a few particles eventually turn into a whole bunch of particles and before you know it, your heatsinks are caked with debris. This prevents precious airflow from reaching toasty components, like your GPU and CPU, which heat up faster and throttle more often. That’s not good.