I just installed Firefox 3 Portable on my USB flash drive (Treckstor USB 2.0, 8 GB) and it is incredibly slow. With Firefox 2 I could almost work normally with the browser as if it were installed, but Firefox 3 is a snail!
It takes up to a minute or more just to launch the application. And from typing an URL to actually seeing the page it lasts about 45 seconds! Are you kidding me? The drive's LED is constantly flashing while browsing, and everytime you click something on a webpage the browser freezes for a short time!
If it isn't suited for a USB flash drive it should be marked accordingly!
It obviously isn't suited! This is not a portable app until these issues are fixed.