The specific byte size for each chunk downloaded in parallel during a multipart download. 8MB ( 8388608 ) max_request_concurrency

The size threshold (in bytes) at which the manager switches from a standard single GET to multipart parallel downloads. 8MB ( 8388608 ) multipart_chunksize

: Core hooks natively support subscriber classes to track byte transfers.

When downloading a file, s3transfer determines whether to use a single standard GET request or split the file into multiple parts fetched concurrently based on your configuration parameters. Key Capabilities of download_file()