Evaluating Elixir / Phoenix for a web-scale, performance-critical application

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There was a similar thread recently. You may find some tips there.

Some low-hanging fruit to improve perf would be:

  1. Raise log level in prod to :warn to suppress logging each request.
  2. If you’re testing a REST endpoint, make sure it goes through the :api pipeline, and not the :browser one.
  3. Build an OTP release and bench against that

Also, check your cpu usage while testing. If all your CPUs are not constantly near 100% then you may have some bottleneck.

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