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CCleaner cleans up these files, temporarily freezes apps when you're not using them, and updates software drivers to make your PC faster. Pros As a freeware enthusiast, I try to find the freeware can improve work efficiency, this CCleaner is a good one of them, when we have a new computer, it usually running very fast, but some time later, the computer will always be getting slower and slower, it is because the operation of various programs will always produce junk files, especially surfing the Internet, so that some people want to upgrade the computer or buy a new one. CCleaner v2. In less than 30 seconds, the program had scanned and displayed a long list of invalid entries that we could then opt to fix or leave alone by unchecking the boxes. Summary I was more than happy to uncover this great site.