Web.dev was the tool that the customer I was talking with used. This free tool runs on demand and was not one I had used before.
There are also lots of other tools out there. I should mention GT Metrix as a well known one, but I think two tools should be plenty to make the point.
Very simply, I use the “Header and Footer” pluging on WordPress to install scripts like the one provided by InLinks. I ran the test on our “Semantic SEO Guide” homepage, which is powered by WordPress. Web.dev showed almost identical results with and without the code:
There was (in this case) only a single point of performance difference. Things to note here include the “First Cointentful Paint” time did not change. That is likely because the code we added in this case uses the “defer” tag, which means it does not run until the important stuff runs anyway. There was a tiny change to the “Speed Index”, however.
You should run the test a few times though, as other factors can impact this speed index. I ran it a second time with the code and got a score of 53 for performance, then 54, then when I started doing it rapidly, I managed to reduce it to 47, but this probably started to cause other traffic on the server.
Does Lighthouse Agree with Web.Dev?
The Lighthouse tool is bundled with Chrome and you can easily find it by “right clicking” in chome on any page you want to teat, then select “inspect”. The lighthouse tool is in the tabs.
Here were the differences, which were again minor:
But WAIT! That is not the whole story!
In this case I tweaked a few things and in Lighthouse the performance score went from the 60s to the 90s WITH THE JAVASCVIPT CODE!
What about Web.Dev? Does it concur? It does even better at 99%
How did I speed up the page?
I implemented most og the options in the “WP-Optimize” plugin. Including:
- Caching .js and CSS files
- I cleaned up my database
- I removed the “Force https” plugin as I could do the Https force with WP-Optimize
- I actually ADDED Jetpack. People say that bloats the code, but for me it showed a performance boost
This test told me three things.