A distributed team uploads large files to an S3 bucket in one Region and uploads are slow over long distances. The content itself doesn't need edge caching. Which feature improves upload speed most directly?
A.Amazon CloudFront distribution
CloudFront caches downloads for readers; it isn't the canonical upload accelerator (though it can ingest traffic).
B.S3 Transfer Acceleration
Correct. Transfer Acceleration exists precisely for long-distance S3 uploads.
C.S3 Intelligent-Tiering
Intelligent-Tiering optimizes storage cost by access pattern, not transfer speed.
D.Multipart upload API alone
Multipart upload helps large-file reliability but doesn't route traffic over the AWS backbone.
Why this answer
S3 Transfer Acceleration routes uploads through AWS edge locations and over the AWS backbone, specifically speeding long-distance transfers to a bucket — exactly the slow-upload scenario described.
Correct answer: B · Last reviewed 2026-10-25
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