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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.
this happens to me in python more often than I'd like to admit. my understand is that it normally means code needs optimizing cuz it's not fast enough yet. it sounds like codewars.com implements the processor time restriction in a way that has some variability due to server load - I'm guessing for practical reasons + realism - so code that's right on the edge of efficient enough may sometimes pass & sometimes fail