P: Slow is the application of presets to an entire shoot

Unfortunately several of the performance gains you delivered in the last release has been lost in this release.  Particularly slow is the application of presets to an entire shoot. Sharpening is particularly slow, lens profiles are terribly slow.  Also as I edit photos whenever I hit the crop shortcut key I see a flash of a previous crop instead of the photo I am working on. I have also experienced a preset being applied to a photo when I have hovered over it but not clicked on it and then I can't reset the photo without stopping and starting LR.  Exports are still slow and previews are back to being slower.  Not as bad as before but slower than the last release.  I am also experiencing LR Not Responding errors on Exports of large file sets.  I have to kill LR to get it to respond again.  Overall I am disappointed you released a version that was this poorly tested and obviously performs slower than the last release after you made such a big deal of the performance gains.