There are two reasons why other analytics programs slow down your site:
They are loaded externally
They have a large tracking script
For example, if you use Google Analytics, then your site needs to load the tracking script from their servers. Requests to external sources always take longer than requests for files on your site.
Secondly, the time it takes to load a script depends partially on its size. The Google Analytics script is about 35kb, and if you have other features like outbound click tracking enabled, there will be additional scripts to load as well.
Since Independent Analytics runs entirely on your site, there is no external request. Additionally, the tracking script is only 2kb, and it’s inlined to the page, so there is no file request at all.
The tracking script uses the WordPress REST API to asynchronously record page views in your database without affecting your site’s load time.
If you measure your performance before and after installing Independent Analytics, you should see no difference, like on the Compete Themes website, which scored 100% on GTMetrix both before and after adding the Independent Analytics plugin.
