They turned Slowly after upgrade to OS 11, and OS 12 has lauched and i afraid to upgrade again, and because in the OS folder (in the OS download folder) has a advise "DO NOT DOWNGRADE THE OS"?? Why Krizz?
Well rewriting firmware and bios is always dangerous and when you upgrade your usually adding on to the bios or at least it is on the psp's and computer and much more other things. So downgrading has a chance of bricking your snes everdrive so just be careful .
Not loading speeds, but any game have save baterry (EX: Zelda a link to the past) when the everdrive is save sram spend big times around 5 minutes or so to create and emulate the save, you have any idea?
probably slow because you formated your card with small clusters size. 32kb cluster size will give max speed.