An encrypted S3 bucket resides in ap-southeast-2 but users in eu-west-2 access it over the internet and need faster transfer performance for large files. Which approach will improve throughput for these remote users?

Enabling S3 Transfer Acceleration routes traffic through AWS Edge Locations globally, optimizing data transfer paths over the AWS backbone network, which significantly improves throughput for remote users accessing S3 buckets over the internet. Users would then access the bucket via a specific s3-accelerate endpoint. Shortening object key prefix lengths might offer minor performance gains for certain S3 operations but won't address the fundamental latency and throughput issues for geographically distant users. Switching encryption algorithms (AES to RSA) is irrelevant to data transfer performance; it pertains to data security at rest. Creating a new S3 bucket in eu-west-2 with the same name is not possible as S3 bucket names must be globally unique, and even if it were, it would involve data migration and not directly accelerate access to the original bucket.