Why Some Tools Load Later

Purpose

Explain why some third party tools load later with Speed Layer, and how that supports performance.

What changes after installation

Speed Layer is designed to prioritize the work that helps a shopper see and use the page quickly. One common outcome is that some third party tools are loaded later than before.

Why delaying tools can improve performance

Third party scripts often:

Run JavaScript on the main thread
Trigger additional downloads
Change the DOM and layout

When too many scripts run during initial render, the browser has less time to paint key content and respond to user input.

How Speed Layer decides when to release deferred scripts

Speed Layer uses a two phase execution model:

Phase 1 runs early and can set up script interception
Phase 2 begins after the page reaches stability signals, then deferred scripts can be released

What should not be delayed

Some tools should load early because they are required for:

Legal compliance (for example, certain consent requirements)
Site functionality needed for the first interaction
Critical conversions on key pages

Why Tools May Appear Delayed (and Why That’s Good)
Ensuring Critical Tools Still Load Properly
How Speed Layer Improves Interactivity