I copy photos from my camera's media (smartmedia adapter) to the 1400 all the time, no pauses in the system that I notice; I've got the G3 with a faster 20 gig drive though. It just copies.
My 5300 has noticeable delays while copying large files (1MB or more) off my CF adapter. My Wallstreet does this too (which is odd...). On the 5300, I'd pin it down to the custom TREX PC Card controller not having DMA and forcing all the data through the CPU. I don't know why this would be the case with the Wallstreet's TI CardBus controller, though.... The PCI bridge ought to be more intelligent than that.
As far as the actual speed of CF, you are far more likely to saturate the CF read/write mechanism than you are to saturate your 33MHz system bus or TREX controller. We did a little informal study of this issue a few months ago (I think it related to FireWire PC Card throughput, actually, but it still applies) and I'm pretty sure we came to a conclusion that would suggest you should never have throughput problems with CF cards (unless they are something ridiculous like 32x speed).
when I boot from the CF card to run Speeddisk (I was the first one I think to do the CF system disk thing, and it was for the purpose of a bootable Norton tools volume this way) the thing runs just fine; and I don't notice that it's hugely slow or anything; it's fun to have it be COMPLETELY silent, no HD sounds :)
I don't know if you were exactly the first - this idea has been floating around for years... But it sure is nice to have a silent PowerBook, isn't it?! Heck, this idea has been taken to extremes: witness <http://www.cosc.canterbury.ac.nz/~greg/hardware/pb150/>
Peace, Drew --
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