The following is a list of settings that you need to add to /etc/httpd/conf/php.conf upon switching to FastCGI:
MaxRequestsPerProcess 1000 FcgidMaxProcesses 200 FcgidProcessLifeTime 7200 MaxProcessCount 500 FcgidIOTimeout 400 FcgidIdleTimeout 600 FcgidIdleScanInterval 90 FcgidBusyTimeout 300 FcgidBusyScanInterval 80 ErrorScanInterval 3 ZombieScanInterval 3 DefaultMinClassProcessCount 0 DefaultMaxClassProcessCount 3 MaxRequestLen 20468982
You’re more likely to adjust the settings in bold above. DefaultMinClassProcessCount 0 instructs FastCGI to keep zero PHP processes running for user when traffic is idle (cPanel account user) . On the other hand, DefaultMaxClassProcessCount 3 tells FastCGI to never allow more than 3 PHP processes running at a time. This settings prevents one users from crashing the server were they to receive a lot of traffic.