Really.
I don’t know what and how you’ve done, but my 13 databases with a zillion and a half of unique words each (coming from OCR), only uses 16GB of RAM and “See also and classify” is almost immediate with global scope.
I take my hat off. You are the best.
Though we have all played our independent parts, the kudos for the awesomeness of DEVONthink 3 mostly belong to @cgrunenberg and @aedwards 
But the sentiment is appreciated by all of us in the company!
Of course developers, but support and other people as well.