When was the last time you did Junk Collection on your PC?
That's something that Windows does not do by itself, but depends on YOU the operator.
I've increased the speed and efficiency of Hundreds of PC's, just by removing all the Junk files on the PC, that have collected over time.
I even wrote a Cleanup batch file, to speed up that process. Takes only a few seconds, to remove thousands or even millions of junk files.
I run it on my own PC, daily, to remove tens of thousands of temp files, etc.
And then, of course, checking to make sure that there are no programs running in the background that are not Absolutely, Positively necessary.
Once you learn how, computer maintenance is really a simple matter.
Good Luck,
TM