Is there a maximum number of files supported/recommended in Photos.app? With the new OS X Photos app released in OS X 10.10.3, is there a hard limit to the maximum number of files (either photos or videos) that the app will support? Or is there a limit to the maximum size of the library? Or are there recommended limits defined by Apple? 

Basically, how well will Photos handle large libraries, and is there a certain point where it would be smart to split a library into multiple libraries?
My Photos library has about 60,000 photos and about 1,600 movies. The total size is about 560GB. About 30,000 photos are uploaded to iCloud and can be browsed by all my devices and desktop machines. So far no problems and interaction is fluid. With old iPhotos it was annoyingly slow to view the library in its entirety and had to split it into yearly libraries. New Photos does not seem to slow down with library size. It's face recognition is also quite a bit better.