I have read in a few places that USB3 external drives drastically underperform Thunderbolt drives. From your experience is that accurate? Will I have problems working on USB3 mass storage or should I be shopping for a Thunderbolt enclosure? My nMP arrives in a couple weeks so I haven't tested yet. My plan is to keep my Lightroom library file on the internal storage and the RAW files (2.5TB of them) on a Seagate USB3 external drive that I have. Is this going to be a good idea?