I've never run Droidfish, but I do know that the regular Stockfish for the PC has a benchmark command. Open Stockfish in console mode (double-click on the executable), then in the console window, type the word "bench" (without the quotes) and press Return.
It will run for a short time, then it will display the time required, the number of nodes searched, and the number of nodes/sec.
I don't know if anyone is interested in seeing how much stronger Stockfish plays on a full blown laptop or PC than it does on your smartphone but you can easily do that by running Droidfish in Android-x86 which you can run off a flash drive. I have run it with no problems.
http://distrowatch.com/table.php?distribution=androidx86
I was thinking about comparing the two but don't know a good test position that would show how much faster one is.
Does anyone know of an android chess program that does a benchmark speed test similar to Shredder?