Bug ID: 13609
           Summary: rsync can be crazy slow on os x 10.13.6 when copying
                    via usb drives
           Product: rsync
           Version: 3.1.3
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: core
        QA Contact:

I am copying files from one USB SATA drive to another connected to a Mac Pro
via USB 3. Rsync should be able to copy approaching 100 MB/second, but it never
copies anywhere near this speed and for a few files, it's so slow as to almost
be stalled, averaging near 131KB/second. The OS is Mac OS 10.13.6 and the rsync
is provided via homebrew.

The command being used is as follows
/usr/local/bin/rsync --acls --archive --delete
--exclude-from=/usr/local/etc/backupignore --sparse --verbose --progress
--xattrs /Volumes/externalhd/ /Volumes/backuphd/external/

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