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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.
(javascript),same timeout.LoL
If you aren't passing the non performance tests essentially instantly you have the wrong approach.
not sure if it's the right answer, but you are assuming that the Codewars' servers are as fast as your computer (perhaps more accurately, that the computing power they allocate to running your code is on par with the one you have on your own machine). 3.5s vs 12s is not that big of a difference, it's roughly the same order of magnitude. usually, when you start wishing you had more computing power, it's time to optimize your algorithms and data structures first
it is mentionned though: