SpeedyFox - does it speed up Firefox portable?

SpeedyFox - does it speed up Firefox portable?

http://www.crystalidea.com/speedyfox
(as a bonus, it seems to run portably )

If so, any suggestions on how often it should be run? (and are there any better alternatives)

I've used SpeedyFox before and it seemed to make a difference (on both a Portable and regular version of FF), but having to manually point it to where FF Portable was installed (and as I've got portable FF and FF Legacy36, doing it twice) meant I fell out of the habit of using SpeedyFox.

Recent comments about slow running Firefox reminded me that SpeedyFox can be run from the command line = can be run via a batch (.BAT) file.

I played around with a batch file, managed to get it running SpeedyFox on both my Firefox and then with the help of google (and dumb luck) managed to make a batch file that, as best as I can tell, will work for my regardless of what the drive letter for my portable drive is :o, I think?

Can someone look at the following and see if there is any problems? (I know the "drive=%cd:~0,3%" is to get the current drive letter, but the "~0,3%" a mystery to me :-p)

set drive=%cd:~0,3%
echo %drive%

rem FirefoxPortableLegacy36
speedyfox.exe /profile:%drive%PortableApps\FirefoxPortableLegacy36\Data\profile

rem FirefoxPortable
speedyfox.exe /profile:%drive%PortableApps\FirefoxPortable\Data\profile

in advance, thanks for any replies