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Native Image Generator
open-in-new
<p>The Native Image Generator, or simply NGen, is the <a href="/facts/Ahead-of-time_compilation/RmP02P47">ahead-of-time compilation</a> (AOT) <a href="/facts/Service_(systems_architecture)/LTBXD49s">service</a> of the <a href="/facts/.NET_Framework/J6QDAUhP">.NET Framework</a>. It allows a <a href="/facts/Assembly_(CLI)/F4EGfYsU">CLI assembly</a> to be pre-compiled instead of letting the <a href="/facts/Common_Language_Runtime/4Y0cUdkd">Common Language Runtime</a> (CLR) do a <a href="/facts/Just-in-time_compilation/rEYDsd8l">just-in-time compilation</a> (JIT) at runtime. In some cases the execution will be significantly faster than with JIT. </p>