"Cut back preliminary server response time" difficulty with IPv6

I’ve utilizing the “GCV 9999 MO EPYC” machine to host a website. Sever is actually tremendous quick. I’m utilizing Apache+Nginx (reverse proxy)+MariaDB+PHP7.4 on Debian11.5.

I discovered a bizarre difficulty. Every time I allow IPv6 on Nginx, I get “Cut back preliminary server response time” on the Google pagespeed check (~2.5s). If I disable IPv6, I don’t get any error.

BunnyDNS is my DNS hosting supplier.

Any concept what may very well be the issue?

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