Safari "Find" is slow Safari is fast at everything, except "Find".  When I hit command-F, I get the beachball for 5 to 25 seconds (and then the Find bar appears as normal and everything's good again).

I have plenty of free memory, and the system disk is an SSD with plenty of free space, and my CPUs are almost completely idle.

What could be causing this?  Is there something I can do or reset or flush to make it not so slow at this one thing?
I would check to make sure you don't have any extensions installed that might be causing issues. Also, you can try "Reset Safari..." and "Empty Cache...", both under the application menu. If neither of these work, you can download a new copy of Safari and replace the one currently in your /Applications folder.
After that, make a reservation at your closest Apple Retail Store and see what a Genius says.