Slow website with low server load

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Hello there,
I’ve a VPS 8 CPUs and 16GB of RAM and Plesk.

The backend of one of the WordPress installation (there are two, but the other one is just a staging site) is very slow, almost 10s to open a page. The frontend is faster, but I’m using a lot of caching strategies ( wp rocket, memcache etc)

The load of the vps is around 1. How comes that the website is so slow and the load is so low?

I already changed the WP\_MEMORY\_LIMIT (2GB) and the pm.max\_children / pm.max\_requests ( 50 each ). The website is using PHP 8.2

What should you do ?

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