Whether there is any value depends heavily on your application. If your Apache is responsible for 0.1% of your costs then this is at most what you can save, ev

Whether there is any value depends heavily on your application. If your Apache is responsible for 0.1% of your costs then this is at most what you can save, even if Nginx was magically zero cost (like zero to install, maintain, zero computing resources, zero outages, zero hiring, zero project risks, etc.) From my experience, most projects have way more important problems to solve and better opportunities to pursue than chase those very small improvements. Frequently it does not matter if one is 10 or even 100 times faster than the other.