At the time of its introduction, Compact Pro offered, by far, the fastest and best compression on the Mac. In use, "Compactor files were never more than 1% larger than StuffIt Deluxe's "Better"/"Best Guess" modes, but anywhere from 25% to 400% faster." Ironically, Compact Pro was even faster than StuffIt at extracting StuffIt files, often at least double the performance. It also allowed background operation under MultiFinder. Its speed remained superior to most other systems even after major upgrades had ended. Testing in the late 1990s show it remaining significantly faster and smaller than versions of StuffIt from years later.