Pagespeed impact of Google Tag manager Containers

This is a system for testing impact of Google Tag Manager containers and contents on page speed

Test Area

Results Area

The following table contains the results of the test. The initial test is simply this page with no Google Tag Manager or other scripts running, so therefore is 100% on performance. As each script/script set is added we can see the impact on performance individually and in aggregate. This helps validate information derived from Lighthouse and other performance testing tools and indicates where improvements can be made by adjusting script triggers, positioning and other parameters.