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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.
Oh indeed, it seems there is no performance test for Java. Good catch!
This kata already has some difficult random tests to check for performance. Do you mean they are not sufficient?
Please add number 19 000 000 to the big numbers test. Next number is 90 000 001 (the difference is more than 70 000 000). That will be a good test for the code performance.