Please, I know this is one of the hoariest, most-asked questions in any help forum, but in 20-plus years of Windows use I’ve never found a definitive answer: why does my computer always eventually run slow?
I know the usual answers given: run CrapCleaner (or equivalent), MalwareBytes, change your AV, de-frag, disable (certain) services and start-at-boot-up progs, fresh install the OS and so on, but only one ever works: a fresh install, preferably with a re-partition beforehand. Suggesting RAM upgrades and an SSD is helpful but to do so would only mask the inner deterioration that seems to be occurring. Modern(-ish) OSs are now so-oo big and their post-install updates so huge that even the ‘fresh install’ route is almost too tedious to contemplate.
Has anyone actually closely observed, quantified and dissected the deterioration in OS performance and come up with a clear list of what is rotting/clogging/distracting the OS from doing its job in a spritely manner, please? Do these observations (if they exist) also apply to all other modern OSs, too?