Maybe try reducing the concurrency to 1 and 2, just to see if you are at all able to have more than one request in flight at the same time?

In reply to Re^3: Benchmarking Perl's Net::Async::FastCGI app consistently return LOTS of "Non-2xx responses" by Corion
in thread Benchmarking Perl's Net::Async::FastCGI app consistently return LOTS of "Non-2xx responses" by Anonymous Monk

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