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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.
Probably not an issue ;-)
I just fixed the Go version. Let me know if it's still failing.
I've just tried it in Go: 3010 ms, 40 really small arrays in the random tests. So any timeouts are probably generic Codewars timeouts (which are not too rare for some of the languages, unfortunately) or it's your solution.
Which language are you talking about? There are only 40 random tests with less than 100 elements each. There are no performance tests going on at all.