Slow loading sites on Unifi Equipment

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Have you seen this already?

Do you have a Linux computer (not the Pi-hole itself) at hand that shows these slow loading problems?

If so, please run

nmap --reason pi.hole -p443          # for TCP
sudo nmap --reason pi.hole -p443 -sU # for UDP

I get:

PORT    STATE  SERVICE REASON
443/tcp closed https   conn-refused

PORT    STATE  SERVICE REASON
443/udp closed https   port-unreach ttl 64

and that with and without any firewall rules on my Pi-hole.