Why does it take so long to move a photo from Lr to PS for editing? I use Command E. iMac, i7, 32 gb memory, fast graphic card (my Mac is loaded!), 3TB storage, etc. etc. Is there a setting that I can change to speed things up?
Please try and turn off the Graphics Processor from the Lightroom Preferences,
Go to Lightroom Preferences from the Edit menu
Click on Performance tab
Uncheck the Graphics Processor
Restart Lightroom and try using it.
Let us know if that helps.