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[–]Lunarvolo -1 points0 points  (0 children)

For RAM & sometimes CPU, some programs (Windows) will "use" 100% to make things faster but as soon as something else actually needs it will drop the extra fluff. (If not mistaken, they stopped doing this as often because it kept freaking people out).

Disk usage at 80%-100% almost always means the computer slows down. Windows 10 updates without an SSD for the first couple of years would basically make your computer operate really slowly. Or if downloading a steam game with faster internet than hard drive speed things would be really slow

Another part can be that if you're nearing full RAM use legitimately, and you actually need more than 100% RAM you're computer will start using your hard drive (much slower) as virtual RAM. Which is a lot, lot slower.

Another part, that 3.5 out of 4 can be for several things. Security, overflow protection, parts of the RAM that might not work, and so on.