[webizen]

the matching php built by lsws plugin is lsphp (PHP + LSAPI) combines with best performance and security.

http://www.litespeedtech.com/php-litespeed-sapi.html

if your environment is dedicated, make sure php suEXEC (Admin CP -> Configuration -> Server -> General) is disabled.

check 'EAProc WaitQ' column (Admin CP -> Actions -> Real-Time Stats) and see if it is non-zero during peak hours. Adjust Max Connections in External App -> lsphp5 if EA WaitQ is non-zero consistently.