This has been discussed in another thread, but I thought it might be worth having a dedicated thread here, especially now the auto save feature is available, as we'll want to dump the full internal RAM to card/USB as quickly as possible.
In my testing, I've not managed to surpass 36MB/sec, so I'm assuming this is the fastest transfer rate currently possible with firmware 0.2.3 beta?
I can achieve this speed with a USB 3 stick, XQD card in a USB adapter and a Sandisk Extreme Pro Class 10 SD card in the slot.
I don't think there's any difference in transfer rate between the internal slot and the USB interface.
Any other observations from anyone?