Yep, seems to hint something in the first paragraph of a performance tip [0] but it doesn't specify how does it choose prefixes, or how many prefixes does it sh

Yep, seems to hint something in the first paragraph of a performance tip [0] but it doesn't specify how does it choose prefixes, or how many prefixes does it shard, or anything... 0: https://docs.aws.amazon.com/AmazonS3/latest/userguide/optimizing-performance.html