sure can't say I'm impressed with any speed increase,, was thinking of going back to 4.0,,
I bought a new tower running I7 and 16 gig of ram,, it blazes though about anything I throw at it but the 4.2 actually seems slower on most all items,,
having never done any video the new 800E has offered a few nice test for me,, 4.2 is really slow exporting a file to a folder on the desktop,, reminded me of the dial up days seeing that bar craw so slow,,
I do like LR but never say it is really fast,,
Derry