Delay when loading website for the first time and high TTFB values when lsapi handler is used.

Issue

A delay happens when a website is loaded for the first time and there is a high TTFB comparing to other handlers.
The issue happens again if the website is reloaded after 30 seconds.

Environment

• CloudLinux OS 6(h)/7(h)/8
• cPanel/Plesk/DirectAdmin/No panel
• mod_lsapi

Solution

1. Set lsapi_backend_pgrp_max_idle = 0 in the /etc/httpd/conf.d/lsapi.conf.

2. Restart the webserver.

Cause

The default value for lsapi_backend_pgrp_max_idle = 30 which means that the 'Master LSPHP' process is killing after 30 seconds, as a result when performing a new request after 30 seconds here is what happens:

Apache creates -->> 'Master LSPHP' process -->> then 'Master LSPHP' creates -->> Worker -->> only after this, client getting a response.

That's why creating a new process takes more time than usual.

Useful links

• https://docs.cloudlinux.com/cloudlinux_os_components/#lsapi-backend-pgrp-max-idle