> All devs did was paste Google Tag Manager and/or some other script injection service to the page. In some cases the devs don't even do that and the page is mo

> All devs did was paste Google Tag Manager and/or some other script injection service to the page. In some cases the devs don't even do that and the page is modified by some proxy out in the production infrastructure. google tag manager is the best tool for destroying your page performance, previous job had google tag manager in the hands of another non-tech department. I had to CONSTANTLY monitor the crap that was being injected in the production pages. I tried very hard to get it removed.