Setting the FPM max requests param to a low number might help (default of
500 is fine).

I've found when benchmarking that the PHP processes don't release memory
very well and have a tendency to grow bigger and bigger, while getting
slower and taking longer to process requests in the process.

After changing this setting I was able to push several 100,000 requests at
the server and maintain a consistent response time and memory usage.
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