The first time you load FB it may take 1 minute but after that, lookup the go/no go in a local cache with a TTL.https://twitter.com/jedisct1/status/981595717398683649 …
Don’t overestimate DNS caching https://00f.net/2012/05/10/distribution-of-dns-ttls/ … (and the situation is actually much much worse today)
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Also, the CPU being 100% busy for a long time after every single lookup would be a showstopper. Try starting Eclipse every 30 seconds while trying to get some work done just to see how it would feel.
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I guess I assumed the black list would be centralized so the blacklist manager would be able to set the TTL. Like <hash>.mycoolbl.com.
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