Google Tag Manager serves as a connection point for marketers and developers. It's a collaboration tool that enables you to ensure that you can install all of the most important tags for your company. There are many scenarios in which you may consider utilizing Google Tag Manager.

Speed: If you wish to optimize page load speeds, you may do so by asynchronously firing the tags inside Google Tag Manager.
All tags inside Google Tag Manager execute asynchronously to provide the greatest performance possible.

Consolidation: With sophisticated editing tools and user rights, you can consolidate and manage tags in a few clicks. Having a central location to handle all of your tags may also assist you in deploying tags more rapidly.