GTM used to load async, but they wanted to support A/B testing.. If you aren't using A/B testing then you would get perfectly good performance by using the olde

GTM used to load async, but they wanted to support A/B testing.. If you aren't using A/B testing then you would get perfectly good performance by using the older GTM snippet, it will just continue to use bandwidth at these 15 minute intervals. Even then it probably will only test the hash to see if the container changed.. This seems to me like one real problem that is pretty trivial to fix leading to a lot of over tuning for some kind of ideal.. and then being stuck if you need to support anything else.