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It’s worth noting that good compilers can actually do a version of this: it’s called profile-guided optimisation <https://en.wikipedia.org/wiki/Profile-guided_optimization>. Not many projects use it, because it’s generally a bit of a bother (build a special version, run your profiling, then build everything all over again), but Firefox gets good mileage out of it. My vague recollection is a typical sort of speedup of 5%.

Of course the modern "scaleable" solution is to ask ChatGPT if the number is even or odd, and then print ChatGPT's response.

Using selenium and chrome webdriver under the hood to do so, as well.

Don't forget to remove the least used 1% of the numbers to make it leaner!