Second, it improves memory usage by allowing for code pages to be shared across multiple processes.Īlthough at first glance NGen appears to be similar to traditional static back-end compilation, it is actually quite different. First, it reduces application startup time by avoiding the need to compile code at run time. This results in two primary performance benefits. NGen refers to the process of precompiling Microsoft® intermediate language (MSIL) executables into machine code prior to execution time. Fortunately, NGen (native image generation) offers some relief.
NET JIT compilation can have performance drawbacks.
Moreover, the generated code is tied to the process that created it and cannot be shared between processes that are running the same application. The machine code generated by the JIT compiler is thrown away once the process running that executable exits therefore, the method must be recompiled when the application is run again. T ypically, methods in managed executables are just-in-time (JIT) compiled.
