Thank You Page
A thank-you page is the page shown after a form is successfully submitted. It confirms the submission, reassures the user, and triggers important tracking events like the Facebook Lead conversion.
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❗ Total Blocking Time (TBT): 270ms (Needs improvement)
This means:
JavaScript is doing too much work
Possibly heavy libraries
Possibly animations
Maybe HubSpot code
Facebook Pixel + Meta scripts
Next.js hydration overhead
A TBT above 200ms hurts the Performance score.
Possible Solutions
Load Meta Pixel after DOM is ready
Why?
By default, Meta Pixel loads immediately and blocks the main thread.
This increases Total Blocking Time (TBT) and reduces PageSpeed mobile score.
Loading Pixel after DOMContentLoaded avoids blocking rendering.
✔ Code Example
Fire custom events manually (Lead, Contact, Purchase)
Why?
Facebook needs the exact conversion events to optimise your ads correctly.
HubSpot Form Optimisation Techniques
HubSpot’s embed script is very heavy and blocks the main thread if loaded on page load.
Lazy-load the HubSpot script
Why?
Prevents HubSpot from blocking FCP/TBT
Loads only when the user scrolls to the form section
Massive boost to mobile PageSpeed
✔ Code Example
Fire a Facebook Lead event after HubSpot submission
Why?
HubSpot submission must tell Facebook: “This person converted”
It improves cost per lead dramatically
✔ Code Example