It's older than a lot of new developers at this point.
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I have all sorts of weird troubles with IPv6 at home. Facebook won't load some content, Netflix will frequently buffer and fail to load, Steam will almost never download things quickly.
Turn off IPv6 on my router, all my troubles go away.
sounds like it may be a wonky dns server. if youre interested, try re-enabling ipv6 but use something like cloudflare's dns in lieu of your ISP's
Either that or the ISP's IPV6 routing is broken