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This tool is an open-source standalone visual interface to make using the Windows 10 compact.exe function more available to more people.
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The compression used by compact.exe is similar to the built-in NTFS compression in that it is transparent. Compressed files and programs can still be accessed as if nothing has changed and show up in Explorer as they normally would — they'll just be decompressed on the fly at runtime. However, the newer algorithms used by Compact are much more efficient.
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For most modern computers there will be no (or very little) performance loss. Those with older HDDs may even see a decent performance gain in the form of reduced loading times as the smaller files means it takes less time to read programs and games into RAM.
Windows 10 includes a little-known but very useful tool called Compact that allows one to compress folders and files on disk, decompressing them at runtime. With any modern CPU, this added load is hardly noticed, and the space savings are of most use on those with smaller SSDs.
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### Additional Notes
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In my testing, using any of the XPRESS modes has no discernible impact on CPU performance when the compressed program is run (Using an i7-6700HQ). Here's the output tests for Adobe Photoshop:
However, if your processor is especially old, you may find that performance is worse when folders are compressed with 8K and 16K. Use 4K instead. Despite this, I've successfully tested it on an i3-370M from 2010, and it had no issues with performance on any of the compression modes.
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