Mailchimp subscription failing

Hi

I’ve experienced an issue on a few sites where a sign up request to a linked MailChimp list doesn’t seem to work with the site cached.
When I or the client’s customers enter details and click subscribe the site seems to hang and then nothing happens. I checked with Inspector and could see a ‘4.80 s ‘Waiting for server response’ message.
After I cleared the LiteSpeed cache I was able to subscribe without an issue.

In my case, the subscription module is an ’email optin’ module within Divi that is linked to with a MailChimp API key.
Is there a way to disable the cache for this specific request?
This is the site that I was experiencing issues with yesterday (under ‘Stay in Touch’): https://limeflower-wellbeing.co.uk/
I’ve currently disabled the plugin.

Thanks
Andy