There are some things that make windows bog down ike cleaning out your internet browser cache. Since you mention that it is slow outside of windows then it is probably not your wow. You could also check to see if need driver updates for your video etc. After a couple of years alot of computer savvy people reinstall windows since it can just bog down from bloated registry and corrupted files. Your system should be screaming fast.

Make sure to not defrag the ssd since that will lower the lifespan of it. Use the TRIM utility if you ssd supports it since ssds get significantly slower the closer to full they get. I think you need to make sure to have at least 20% space free on it for best performance.