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Mobile Load Speed Issues - GTM

Hi there! I’m facing big issues with my website’s mobile speed. I know I’m using a few scripts (mainly GTM) but I don’t understand why the mobile speed is affected this much. Even with pages containing only text (like, the mobile speed score on Page speed insights is always below 40.
Could anyone help out or advice on how to improve this?
Thank you so much!

The easiest way for you to determine what is slowing your pages down is to create a base mockup page with all the extras not loaded. Then test. Add something back then test again. You can then make decisions based on the impact and value.