By default, when does the JIT compiler usually compile a method?
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When the developer packages the application
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When the application loads
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The first time it is called
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When the application is installed
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Each time it is called
JIT (Just-In-Time) compilation occurs on-demand - when a method is first invoked at runtime. The method is converted from IL to native code immediately before its first execution, then cached for subsequent calls. This is the core 'just-in-time' concept - compiling right when it's needed.
The Just-In-Time (JIT) compiler defers compiling a method's IL into native machine code until that method is actually invoked for the first time, rather than compiling the whole assembly upfront; subsequent calls reuse the already-compiled native code for better performance.