How to measure performance gain

Hello,

I’m using several tools:

The easiest is the plugin Query Monitor. You get directly the process time in the admin bar. However, if you load the same page several times, you may get very different results, so you need to make each test let say 10 times, eliminate too high results (because the computer was doing something else at the same time), and keep the average

I’m also using ab – Apache HTTP server benchmarking tool. This is a command line tool I have on my Linux box. It should be used on the same server as the WordPress install to avoid interferences with the internet connection. The advantage is that you can make several http requests in one command and you get the average result as well as a distribution. It’s thus much more efficient than Query Monitor to make several tests on the same page.

WHile developping, I’am also using a profiler which allows to detect where the code requires optimization.

Okay, great, thank you. (This is from someone really suffering under massive speed losses just in rendering the website once it has more than 1 language. Using the backend is the worst experience, too.)