Today, I find myself trying to do the same, for my computer. This machine, which was on the upper end of graphics and particularly game performance when I bought it a few years ago, has in the past six months become extremely choppy, laggy, and generally hard to work with, so today I'm uninstalling a bunch of old stuff, updating AVG and Malwarebytes, and generally trying to clean the digital house. It doesn't help that AVG is turning into exactly the same pushware/adware crap that once made it better than Norton, but for the moment I don't know of a better antivirus choice.
I suspect that when the time comes that this computer does become unfeasibly creaky, I will try jumping ship to a Mac. I'm loving my little Macbook Air lappy so far, and in an alternate universe I probably just bought the biggest baddest Macbook Pro I could get my hands on and made that my only computer, instead of having one for writing and one for everything else. I have been reluctant to abandon PCs, largely due to wanting backwards compatibility with old games that I've loved in the past, but looking at my actual current habits, well, there's actually nothing I do with this PC that wouldn't work just as well on a Mac, and plenty of things I am doing now that would probably work better on a newer, cleaner machine.
But, that's definitely for the future. Like, after the house is sold future. For the time being, I keep on patching up this machine. Temp file deletion time, ho!