[Watabou]

I would agree with you if Apple hadn't released 10.9.1, but honestly, Apple has fixed the Finder issues for me.

Quicklook is still slower compared to Mountain Lion for me, so I hope they make it faster still.

[protomyth]

Move some picture files from one folder to another with preview item on and watch the finder hang after about twenty files. It is damn near unusable at this point. I gave up for big sorting and just have a button on the finder toolbar that opens a terminal in the folder the window is showing and do copies that way.