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The graph seems to indicate that some PHP processes (if not all of them) take 30-45 seconds to finish as requests in processing pile up from 5-30 seconds steadily. The Initial Request Timeout (30) and Retry Timeout (15) can explain why there is a dip for requests in processing at 50 sec mark (quite a few timed out as NOT yet finished processing).
So the issue is why PHP scripts took a long time (even timed out).
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