And here is a writeup with more on how we made this happen:
"Optimizing optimizing: some insights that led to a 400% speedup of PowerDNS
So no matter how pretty your code, eventually someone will benchmark it and
demand top performance. Squeezing microseconds is a very addictive and even
destructive activity. It ruins your evenings, destroys your ability to
converse with human beings and typically leaves your code in a mess."
Perhaps a fun read!
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