Why Huge TTFB on VPS?

Question

LiteSpeed ​​Web Server

Colleagues good evening, I can't understand why ttfb is big? I have already changed the hosting, but it's still huge to the cache. here are a couple of sites one on joomla prosalsk.ru another on wordpress pirogibuki.com. Comes especially on Joomla to 7 sec ttfb. The OLS server with the CyberPanel + LsCache panel is both there and there .. Maybe because of Cyberpanel it slows down? though it shouldn't.