Here&#x27;s the other side of the story: Not a sysadmin, but I&#x27;m an independent programmer with an online app. I&#x27;ve set up a Debian vps at OVH with IPv6 and it was unbearably slow. I used to believe it was OVH, but the reason seems to be that most things e.g. package managers wait for the request in IPv6 (or the one to the DNS) timeout before trying IPv4. An apt-get upgrade takes hours. I guess there&#x27;s some kind of configuration to improve that, but when step 0 of setting up IPv6 starts with problems, I just stick to stacks that I can manage.