Speed Comparison TestHere you will get information about a speed comparison between the comparison method Byte by Byte and SHA-1. The additional options "Ignore Exif metadata of JPEG files" and "Log every x minute the search statistic of the scan progress info" where activated for each scan.
The files of the scanned folder were stored on an external hard disk connected via USB2 and encrypted with TrueCrypt. AllDup was installed at a computer running Windows 7 x64 with 8 GB RAM and an i3 CPU.
Test with the comparison method Byte by Byte:
Test with the comparison method SHA-1:
As expected, the comparison method SHA-1 wins the rally. Comparing only the checksums stored inside the RAM reduced the file read access and can save a lot of time.