Mr. Flash is also very slooow with my Minolta Dimage 7.
The files run in the 2Mb range and the Mr. Flash card(s) record(s) this amount of data at a snail's pace.
I bought two from Newegg, a 128Mb and a 64Mb.
Although I complained to Newegg about this 2x, they just blew me off.
They should post a warning on their site...IMHO.