Currently, S3 provider does 1 API call per folder, ignoring the keys not belonging on that folder. So for each bucket there is N calls to display the tree. However, it is possible to load all the assets and folders in one single API call. We will do so adding a children collection to S3Folder to store all the descendants. It is also needed to update the caching strategy.

One additional improvement consists on adding a map of bucket-region in AmazonS3Gateway. Regions are inmutable and so we avoid doing extra calls for obtaining the region of a bucket. Moreover, as S3 is eventually consistent, when a bucket is created, there is a race condition that could raise an error if the new bucket has not yet been created in the default region.