No, not very fast at all. I cloned a 7 GB 10.4.11 install from a PATA ext HD to a CompactFlash card recently. The interface at least, was FireWire 400 on both the source & the destination devices, though. This was to get the G3 Pismo working from an ext FW-to-CF card reader. I wasn't silly enough to try doing that on the Pismo itself, the 2.3 GHz dual-core G5 PowerMac got that job.