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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I was curious if ooflorent was correct so I tested it on my laptop using Node.js. Precalculating did not speed it up in my tests, so I would agree that it is not necessary. But it's always good to test if you're not sure. And to ask questions :)
Nope. Modern JS interpretors optimize it.