WordPress, NGINX, Cache, Plesk, and why is my TTFB so high

To put it mildly, tuning a server is complicated, even for incredibly common setups and out-of-the-box solutions. In the end you’ll hear mostly that you need to install this, or that, plugin. You do, but you don’t. In reality most systems seem to have moved to an NGINX setup and all of the .htaccess rule…