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 minutes the search statistic of the scan progress info" where activated for each scan.
The files of the scanned folder where 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.
The log of the first scan using the comparison method Byte by Byte:
The Log of the second scan using 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 saved a lot of time.