Yes, I know ccleaner can even clean up to 15GB for people who never cleaned their history lol. Especially if they use Google Chrome. A lot of cached data ... But I prefer to it with one click from browser itself. I've seen slow ubuntu tho it got fast again after installing updates. Defragmenters won't defrag pagefile anyway. The best thing is to delete pagefile (when it's fragmented) booting from live cd time after time and recreate it.