Inventory first

Do not delay every external script with one command

The safest route is to give a developer the PSI provider list and the purpose of each integration. Consent, payment, CAPTCHA and analytics require different activation strategies.

Third-party integrations are classified, assigned safe activation methods and functionally tested
Backup → classify services → choose activation → verify functionality.

Message for a developer

Review the PSI third-party providers on the submitted page.
Document the purpose and essential events of every integration.
Reduce initial-load impact without breaking consent, payments,
CAPTCHA, authentication, forms, analytics or advertising goals.
Create a backup and show PSI/DevTools before and after.
Verify analytics, advertising and chat separately.

Optimization sequence

  1. Open PSI → Performance → Third-party code and list providers.
  2. Identify owner, purpose, pages and required activation moment for each.
  3. Remove only confirmed duplicates and unused integrations.
  4. Use async or defer for independent scripts while respecting dependencies.
  5. Activate non-essential chat, maps and widgets during idle time or interaction.
  6. Coordinate marketing services with cookie consent and analytics requirements.
  7. Repeat PSI, record Network/Performance and test user journeys.

Technical notes

Independent script

<script async src="https://vendor.example/widget.js"></script>

async executes when downloaded and does not preserve order.

After HTML parsing

<script defer src="https://vendor.example/app.js"></script>

defer preserves order and runs after document parsing.

Do not use a blind fixed delay

Starting everything “after five seconds” can lose short visits and events. Prefer consent, browser idle time, proximity or a relevant interaction.

Verification and rollback

  • Place a test order, submit the form and open the chat.
  • Use analytics and advertising debug modes to confirm events.
  • Check the console for dependency errors.
  • If functionality is lost, restore the original and change one integration at a time.
  • Record the result with the manual third-party check.

First-party JavaScript minification, fonts, images and code errors are separate work.