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There are several factors that can affect this, such as where you were extracting from to where. Extracting a file from partition A to A will differ from A to B. If you're going from A to B it will undoubtedly go slower as it has to 1) write data to an area of the disc that is farther than what it would be in the same partition, and 2) write to the FAT or LVM of that partition. Other factors include the current state the system is in (under load or not), other writes not relating to the extraction in the queue, whether the extraction is using a page file instead of RAM (and where that page file is), and so forth. It also depends on just how fragmented the drive is - usually a single pass with Windows Defragmenter will not completely defragment a drive, and that's no considering system files in use and page files. There are more factors to it as well, but these are some of the bigger ones. All in all it's not surprising.
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