The FastCGI module in IIS has a configuration setting maxInstances, which controls the number of concurrently running php-cgi.exe processes that IIS creates to process PHP requests. To achieve optimal performance, it is recommended to fine tune this setting for your specific environment starting with 8-10 instances per CPU core (e.g. maxInstances=32 for quad-core CPU).
The Windows Cache Extension for PHP can be used to improve performance of PHP applications running on Windows operating systems. The ext...
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