I'm having this problem for months now. When browsing the web on my iPhone most websites seem te be stuck loading content. It takes >10 seconds to load sites like macrumors.com and 9to5mac.com. Other devices like Windows-laptop and MacBook don't have any issues.
Rejecting traffic with iptables didn't solve the issue, and I'm not running IPv6. I've edited /etc/pihole/setupVars.conf to try with the true IPv4 address, with 127.0.0.1 and 0.0.0.0. Does not help at all.
That's no solution. That wil disable the function of Pihole for those ads. The problem has something to do with the timeouts of SSL-traffic from Apple IOS.
'Half-load' would be fine, because it would be fast. The problem is not incomplete webpages, it takes 20seconds to load a whole.