Unfortunately, transfer speeds directly from the camera are deathly slow.
I've done some testing with P2 ingest speeds and found that the fastest direct-from-camera ingest method is to use USB and P2 Viewer (or P2CMS on Mac).
Test is here:
http://octopodblog.wordpress.com/2012/07/19/adobe-prelude-cs6-p2-ingest-spe...
Kyle Fordrung
Octopod Video Labs
http://www.octopodlabs.com