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This makes it possible for you to check files in torrents so that you can stop downloading immediately once you find out that the files turn out to be not exactly as your expectation. Moreover, BitComet can preview files while they are being downloaded. Instead of completely relying on Windows caching, the client provides you with options to manage the cache for the most optimum performance.
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The disk cache mechanism in BitComet is an interesting feature. The portability is great, but it is the other features that determine whether BitComet is worth trying or not. There is an installer to use BitComet but a portable version is also available for free, allowing you to skip the installation process. However, you need a torrent client to do it. Downloading a large file from a torrent is preferable because it is usually faster as long as there is a good number of seeders.
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