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    Provide your FastCGi settings. Have you considered using the thread-safe version of PHP which would efficiently spin up multiple instances. You probably should think about upgrading the server specifications to better match the current load
    – Ramhound
    Commented Jun 16 at 9:11
  • Thank you, I used the non-thread-safe version because I read that Microsoft recommends using it with IIS and FastCGI. Should I still try the thread-safe version? Also I updated the post and added an image of the FastCGI settings - note that the value of Instance MaxRequests is 10000 but I tried several other values with no change in performance - 200, 400, 1000, 5000
    – Stackerito
    Commented Jun 16 at 13:30
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    You sure those are the actual settings? Your screenshot clearly show there are more than 4 instances
    – Ramhound
    Commented Jun 16 at 14:10
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    MaxInstances is defined as “Specifies the maximum number of FastCGI worker processes that can be started in an application pool. Acceptable values are in the range from 0 through 10000.” where the default value is 0.
    – Ramhound
    Commented Jun 16 at 15:49
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    You just don’t have enough resources to serve that traffic. One usually has more processes/threads than cores simply because most common workloads imply waiting (for a remote database server or for disks) and that’s where the bottleneck is, but here the bottleneck is on the CPU. If you reduce the number of processes you just switch from sharing the cores in parallel to sharing them in series, basically (unless you have issues with RAM and swapping due to a very large number of processes).
    – jcaron
    Commented Jun 16 at 16:16