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How Speed Layer Handles Analytics Scripts

Purpose

Explain how Speed Layer interacts with analytics and tag manager scripts, and what to validate after installation.

Why analytics scripts affect performance

Analytics and tag managers often load early, then pull in additional scripts. This can:

  • Add main thread work during initial render

  • Delay when important content becomes visible

  • Increase long tasks that affect INP

Background:

How Speed Layer approaches analytics scripts

Prioritizes shopper visible content first

Speed Layer’s goal is to let the browser render key page content before running non critical third party work.

Can defer selected third party scripts

Speed Layer can delay scripts that are safe to run after the page is stable, then release them in a controlled order.

This is especially relevant for scripts that:

  • Are not required for the page to render

  • Do not need to run before the first interaction

What Speed Layer does not do

  • It does not rewrite analytics vendor code.

  • It does not change your analytics account configuration.

  • It does not guarantee a specific vendor will load at an exact timestamp.

What to validate after installation

Confirm that:

  • Your primary analytics script still loads

  • Key conversion events still fire

  • Tag manager containers load and downstream tags execute

If tracking is missing, check whether the vendor script is considered critical for your site. Some scripts must stay early to support attribution requirements.

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