Mats,
It is also so compact that it readily fits into the cache of a modern CPU, which does wonders for speed. The only drawback is that it is a stack-oriented machine, and I think that a register-oriented machine would prove to be significantly more efficient on CPUs with pipeline and cache.
I don't think this would make much of a difference, I bet the most CPU time will be spent during calls to a "SELECT" function anyway. IMHO the advantage of having a very compact runtime and easily validated bytecode trumps all.
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