It's slow for me from FireFox with uBO. When has the HN site ever hit an FB url? I don't see any references to any FB related urls in source, uBO, or dev tools.
I wonder if the fact that I can't access HN from my wifi networks' IP address is related. If I use a VPN or a different wifi network, all is good. But, on my home network, it just times out. :/
Likely DDoS to DNS servers looking for the missing facebook domains.
See below entry for more details https://news.ycombinator.com/item?id=28748203
Edit: The error page says "We're having some trouble serving your request. Sorry!" and I get it once out of every 3 or 4 requests.
Leaving the comment below, but that's the answer.
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If I access HN from a web browser that blocks all known ad-related sites (including FB), HN is as fast as normal.
If I access HN through my "regular" browser, it's very slow. This looks like HN timing out trying to hit FB more than load making it slow.
Looking at uBO, it's not reporting blocking anything on the page. Yet the performance difference is real. Weird.