yeah. My ISP actually have a deccent IPv6 implementation (but uses CGNAT unless you pay extra for a fixed IP) but their default router is crappy so I replaced it with a ubiquity ampliFI which is great on IPv4, can more or less fill my gigabit fiber, but on IPv6 it maxes out at 250 megabits. So I get better performance disabling IPv6 :( The isp router have no such issue, just bad WIFI and bad NAT performance for IPv4.
