So ...

I'm talking about a handy plugin called Simple Blog Stats (230 KB).

Here it is:

https://wordpress.org/plugins/simple-blog-stats/

Let's see the usual speed tests ...

Here are my results before installing the plugin ...

... and the result after installing and activating the plugin:

Which means an additional 0.06 second ... Literally imperceptible ...

With that having said, let's see how it works ...