Jim, I respectfully disagree (am I actually allowed to do that? 
?)
DT2.x: I scan 20 items to DT with OCR on import. When the first item has OCR’d, a window opens, requesting me to enter metadata. Whilst that window is open, OCR continues on the 2, 3, 4, … document.
DT3: I scan 20 items to DT with OCR on import. When the first item has OCR’d, a window opens, requesting me to enter metadata. Whilst that window is open, OCR does not continue on further documents. OCR is performed on a document by document basis, waiting for metadata to be entered.
Whilst I am aware that I can choose not to enter metadata on import, but rather add it later, the behaviour most certainly has changed between DT2 and DT3. Whilst OCR has also become rather faster, this limitation is still a bit of a pain. I posted about it some while ago here: DT3b3 - Waiting for next OCR