S3 Transfer Acceleration is an optional and added feature supported by S3 that allows clients to transfer the files from remote locations in a fast and secure way. This feature is disabled by default and enabled when needed. When enabled, additional data transfer charges may apply as this feature makes use of the edge location closest to the client.
If you are moving more data between regions, or moving a lot more data across continents, or if your customers are sitting very far away physically from their AWS regions, or if you move large number of objects, S3 Transfer Acceleration is quite a useful feature here. AWS expects that your transfer will be more than 300% faster for most of the use cases and AWS will not charge the customer if the transfer is not faster.
AWS provides you the S3 Transfer Acceleration Speed Comparison tool and it can be accessed...