The following is a comparisons of Flash vs MMC (obviously not a type 3 scientific study of P<.05, I know, I know) average of 8 runs +/- 1 seconds:
Both runs under the same environment 8 times

N770 running 2006, the latest edition
______________________________________________
(all measures in seconds, the lower number the faster)
Flash MMC
Boot 38 36
Inet 1st loading 45 44
subsequent load 7 8
Gnumeric load 16 15
Recalc 7 7
Switch off 10 9

I would say, the speed difference is practically zero. I would be curious to see how the two measures in a N800. For me, the booting from MMC is mainly for the benefit of having a safety net if I mess up the OS and also the
convenience in testing new OS/upgrades.

Cheers,

Bun