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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.
Quite possibly because it wasn't implemented in the JavaScript version, which is the original.
Yeh, same for me. First couple of submits timed out, then eventually came in just under 12s.
CW code runner servers were choking badly yesterday, so everyone is experiencing the same problem, not just this kata ;-)