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According to this link precompilation with AOT produces worse results than normal JIT execution. If so, what is AOT useful for?

"Da AOT-Code über verschiedene Programmausführungen hinweg bestehen bleiben muss, ist die Leistung von mit AOT generiertem Code nicht so gut wie die von mit JIT generiertem Code."

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It helps with startup time. It's not that it produces worse code, it's that there's multiple levels of compilation. It stores the equivalent of -O1 on disk, and eventually some of the code can ramp up to -O3+. This is almost entirely to help startup time so that you don't have a bunch of code trying to compile during startup.

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