The -P (progress) option causes rsync to generate a small progress report after each file is copied. The speedup figure will represent the ratio between the small amount of data that was required to be transferred versus the total size of the files. It will only send the differences between the files, not the entire files. When rsync is next used, it will optimize the transfers. If rsync needs to copy all of the files in their entirety (the first time it is run, for example) the speedup will be 1.0.
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