Limit the amount of start up processes and you wont have to deal with any major slowdown. The more that gets opened at os launch the worse your experience becomes.
First thing I did when I booted up my new computer was to limit the number of startup programs. Problem is, each time I install something (MS Word, QBs, FFXIV, etc.) I end up having to remember to limit those too.
Only thing that starts up when I log in is my anti-virus.
King, programs I use to keep my fire engine clean are freeware from IObit.
https://www.iobit.com/en/index.php
If you download their stuff from major geeks that site often tries to get you to download other crap on the way in. Read each window carefully.
I do not know why they do business with major geeks.
I don't download freeware. I keep my PC clean pretty often.
My old computer was about 12 years old. Still had Windows 8.0. I could buy a new computer each year, but why waste the money? Old one still works, works fine. I just was running out of space and will be using it as a "investment tool" only computer (not using it for games, that's what my new PC is for).