Check 10 / 12 LOW impact In the full checklist
Minimize third-party scripts on checkout
What this check is
Checkout is the page where a slow script costs money directly, and it is the page where marketing tags tend to be stacked most heavily. Every script there must justify itself.
How to implement it
List the scripts that load in the cart and checkout, remove or defer anything not needed for measurement or payment, and move analytics to server-side or consent-gated loading where possible. Re-test after each change so a payment method does not break.
How to verify it
Time the checkout step with the scripts enabled and disabled, and confirm the conversion events still fire after the removals.
All 197 checks, one Google Sheet
This page is the summary. The full checklist carries the priority, the impact score and the tool link for every check — all 197 of them, across 14 categories, as a Google Sheet and CSV with lifetime updates.
$19 $197 one-time · 30-day money-back guarantee
Unlock 179 checks — $19