This can affect your computer's overall speed, since the computer's pretty much just waiting on data while those platters spin, regardless of the speed of the computer… The moral of this story is that fragmentation is a good and necessary thing. However, that compressed file is smaller on the disk, so your computer can load the compressed data from disk faster. The only disk based factor (along with actual drive performance) that would affect performance is how much fragmented your drive is. Disk -- Because of the limited page fault activity, disk I/O bandwidth would be minimally impacted Spyware and viruses can be very harmful to a computer's overall performance, and although virus scanners and other utility programs can help to remove these malicious items, they are not always successful. There's a chance your page file is largely fragmented (depending on when you last defragmented, which is best done monthly), and also that your game data is all over the disk. Using a faster disk, such as an SSD, will typically give you better read and write performance compared to an older HDD, but how does this affect PC gaming? Well, that depends. I use an utility called "WinContig". The hard disk performance directly affects everything else on the computer and is therefore the weakest link. Now in other aspects it can. The faster the platters of hard disk spin, the less time the hard drive will take to pull upon a certain data. Such a feature greatly improves disk performance. [45] Most hard disk drives today support some form of power management which uses a number of specific power modes that save energy by reducing performance. However, reformatting a hard drive deletes all files on a computer, including the harmful ones, and returns the system to peak performance. TLDR: It depends If we are talking the difference in frame rates of a 5K rpm drive vs 7.2K rpm drive then no. When you load a compressed file, the CPU has to do more work decompressing it. 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