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There have definitely been large-scale events running on AWS that exceed the performance parameters you mention. For example, Prime Day 202. However, these events generally happen after careful planning and design as well as a bunch of testing (which I'm very glad to see you doing).
One of the things that usually pops up during stress/load testing are the quotas placed on each account for various services. I suspect that you may be bumping into those.
One thing you can do in the short term is to request limit increases for the services that you are using via the AWS console.
However, I'd also strongly recommend that you reach out to your local AWS Solutions Architect who can work with you on your application design - that's our job and it's what we're here for (to help customers get the best out of the platform).
Your test results show long response time (about 10k ms for 90 percentile). It looks like there is some bottleneck point (ex. DyanamoDB throttling by capacity units with retry logics). You may see the cause of high latency by activating X-Ray for the api gateway and the lambda function.
Hi, I checked the logs and I cannot see any throttled requests. Cloudwatch is saying that there are no throttled requests.
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Where can I reach out to such AWS Solutions Architect? Is there any special service for that?
I would start by checking LinkedIn in your local area; it's not possible (yet!) on re:Post to send personal messages otherwise I could recommend someone directly.