S3 signed download suddenly very slow

Question

I am using S3 as storage for TeamCity project builds.  These builds are between 14GB and 16GB single files, with a few smaller (bytes to 200MB) support files.  The builds are being accessed by members of the team in mainland Europe and the UK, and we are using the Ireland AWS region for S3 storage.

This has all been working great for the last few weeks, however since last night all members of the team are experiencing very poor download speeds.  I have had reports of 5Mbps up to about 20 Mbps!  Given this is from team members all over the UK and Mainland Europe and even my own connection, we can rule out it being a single ISP having an issue.

Presently a team member actually located in Ireland is hitting 100Mbps, so it seems that AWS might be having bandwidth issues out of Ireland?  Although yesterday they were reporting much lower speeds.  Is there a transit link down perhaps?

Any suggestions?

Answer

I am not aware of any events impacting AWS Simple Storage Service (s3) at this time, but the geographical location of your users seem to follow in line with expectations. I would suggest using Cross Region Replication (CRR) to keep the files closer to the end users in mainland Europe.
CRR: https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication.html

There's a good guide on troubleshooting inconsistent speeds here on re:Post: https://repost.aws/knowledge-center/s3-troubleshoot-slow-downloads-uploads

I would also recommend S3 Transfer Acceleration (S3TA) to serve through edge locations as well: https://aws.amazon.com/s3/transfer-acceleration/
There is a speed test for this feature here: http://s3-accelerate-speedtest.s3-accelerate.amazonaws.com/en/accelerate-speed-comparsion.html

I hope these suggestions help resolve your download speeds.

S3 signed download suddenly very slow

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