Hello Claudio,

Thank you for reaching out and I am happy to help!
I am unfamiliar with the Klaviyo integration so I cannot give specific instructions for the W3 Total Cache setup in this case, especially because of the lack of documentation related to the interaction with the caching plugins.
Can you please specify if this integration is on any specific page and please share the website URL and the URL of the page you are referring to so I can check and inspect the source
Thanks!

Hello Jackie,

I will reply to this topic and close the other one so we can avoid duplicating the answers.
I am not familiar with Klaviyo and as I mentioned before, they do not have sufficient documentation that I can check and provide assistance as I am unsure how it works and what is the actual problem
Have you by any chance tried reaching out to their support, and check what are the recommendations with the optimization plugins?
Thanks!