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The 50% faster number above is not about better query plans. This is 50%
faster at the low-level grunt work of moving bits on and off disk and
search b-trees. We have achieved this by incorporating hundreds of
micro-optimizations. Each micro-optimization might improve the performance
by as little as 0.05%. If we get one that improves performance by 0.25%,
that is considered a huge win. Each of these optimizations is unmeasurable
on a real-world system (we have to use cachegrind to get repeatable
run-times) but if you do enough of them, they add up.
https://web.archive.org/web/20141008043345/http://permalink.gmane.org/gmane.comp.db.sqlite.general/90549

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