Shouldn't be the case. Installed all drivers?
steve jobs slowly making you into a woman
you don't need to reinstall, just review what programs / apps you don't use anymore and what services are running in the background and uninstall / disable them.
if you don't have anything in particular, then it will run the same after reinstalling, so your impression of "running smoother" initially might as well be a placebo.
formatting my PC is like taking a shower for me, once a month
I do that occasionally as well, Windows 10 is very good at running tasks in background