Website LAGS only via CUSTOM DOMAIN

Hey everyone :smiling_face:
I’m super confused and need your advise!

I recently posted here about my website’s animations/interactions starting to lag out of nowhere.
I’ve followed all steps to fix it, without managing to fix it or finding the bug unfortunately.

Now I figured out that the lagging only occurs when accessing the site through my connected custom domain!
When opening it though the .webflow.io URL, it’s all smooth!

Can anyone advise me here?
Any help is appreciated!!

This is the site: https://purestudios.group (Password: Tester1!)

Webflow URL: https://purestudios.webflow.io/ (Password: Tester1!)

Read-only link: Webflow - Pure Studios
Thank you <3

Best,
Simon