In a recent discussion about how to optimize some code, I was told that breaking code up into lots of small methods can significantly increase performance, because the JIT compiler doesn't like to optimize large methods.

I wasn't sure about this since it seems that the JIT compiler should itself be able to identify self-contained segments of code, irrespective of whether they are in their own method or not.

Can anyone confirm or refute this claim?

java optimization jit compiler-optimization
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