Core Web Vitals are Google’s set of user experience metrics that affect your search rankings.The three main ones are: Largest Contentful Paint (LCP) — how fast the main content loads, Interaction to Next Paint (INP) — how quickly your page responds to clicks, and Cumulative Layout Shift (CLS) — how stable the page is as it loads.  Tracking tags — especially third-party scripts loading in the browser — are a leading cause of poor Core Web Vitals scores. Every JavaScript tag adds to the page’s processing time. Tags that inject ads or content can also cause layout shifts. 

How removing tags helps:

fewer scripts means faster rendering (better LCP), less blocking JavaScript means better responsiveness (better INP), and no layout-shifting widgets means a more stable page (better CLS). 

What to do:

Audit all tags in your GTM container. Remove any that are no longer active or needed. For tags you must keep, load them asynchronously and only on pages where they serve a purpose.  The most effective approach is moving to server-side tagging.

Seers.ai’s server-side tagging moves tracking off the browser entirely — reducing the JavaScript that blocks rendering and directly improving your Core Web Vitals scores.