SFV Checker is one of the fastest Simple File Validating tools out there - as far as I know (The checksum calculating routines are completely written is assembler).
If you like this tool please link to my site and let others know about it.
How to use it
This tool has no unnecessary GUI or command switches - just place it in the same folder as the .sfv file(s) and execute it.
The latest version of SFV Checker - Download ( 12,6 kB)