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Hi,
When using the CLI, did you optimize its config parameters as per https://docs.aws.amazon.com/cli/latest/topic/s3-config.html ?
Also, I would suggest to try 3rd party tools like rclone to compare perfs with CLI. Rclone works fine with S3. See https://rclone.org/
Best,
Didier
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Details are important. I'm going to assume that "500m" is 500 megabits/second because you have a 1 gigabit/second link. What is the latency to the region where you are using S3? What software are you using? How did you test iperf3 (parameters are important). How large is the file that you're transferring?