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See if disabling the setting "Uncloak canonical names" in uBO helps.

There are similar loading delay issues as you describe when uBO has to resolve DNS names if you are behind a proxy.

Thank you a lot! I just tested it on my Android phone and finally I don't have to wait seconds before I see any page content. I was really puzzled what caused this problem for a while.

What does this do?

See here in the uBlock Origin wiki: https://github.com/gorhill/uBlock/wiki/Dashboard:-Settings#u...

Which in turn, links to this for background information https://www.theregister.com/2021/02/24/dns_cname_tracking/

Oh wow, this is more than a performance problem, this is a mitigation for a data security problem that only got introduced because trackers try to work around per-domain cookie isolation.

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