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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 have the same issue. It passes basic test but times out on the attempt test. First the basic test took like 2000+ ms but I manage with some optimasation to lower it to ~40 ms. Is that still to slow to pass the big test?
Please see this paragraph: https://docs.codewars.com/training/troubleshooting#timeout