Those must be cached pages from dozens of servers on the backend.
There is no way in heck it's realtime queries.
I can tell when authors are in the WP backend on the server just by looking at the server load because it's crippling.
The wordpress bottleneck is not nginx vs apache vs whatever, it's the problem of loading hundreds of files for any kind of page render (even to just authenticate for ajax, etc.) and over a hundred db queries in many cases.
There is no way in heck it's realtime queries.
I can tell when authors are in the WP backend on the server just by looking at the server load because it's crippling.
The wordpress bottleneck is not nginx vs apache vs whatever, it's the problem of loading hundreds of files for any kind of page render (even to just authenticate for ajax, etc.) and over a hundred db queries in many cases.
A cache-miss in WP is a terrible, terrible thing.