I've had the analytics tag on our sites for about 6 weeks, so this is based on limited data.
To date there have not been any instances of slow page loading that I could pin on the analytics tag.
- it loads pretty quick according to my own measurements, much faster than the pages that it is on
- it is placed at the end of the page, so almost all other elements on the page get precedence in the browsers fetch queue
- if it should load slow that will only result in the browsers 'loading' indicator to be active a bit longer, the actual content will be on the page already
To date there have not been any instances of slow page loading that I could pin on the analytics tag.
- it loads pretty quick according to my own measurements, much faster than the pages that it is on
- it is placed at the end of the page, so almost all other elements on the page get precedence in the browsers fetch queue
- if it should load slow that will only result in the browsers 'loading' indicator to be active a bit longer, the actual content will be on the page already