How would you make this switch statement as fast as possible?

Question

2009-12-04 UPDATE: For profiling results on a number of the suggestions posted here, see below!

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The Question

Consider the following very

Answer 1

You can get a mild speed-up by ordering the codes according to which ones are most used.

But I agree with Cletus: the best speed-up I can think of would be to use a hash map with plenty of room (so that there are no collisions.)