Jeffrey Richter wrote a remarkable piece in the book, I do not know if she had a third release, but a great fragment written in 2002 about Ngen'ing, which is still relevant.
Main characteristics:
Meanwhile, there are several potential problems with NGen'd files:
. , , NGend IL . , . CLR NGend .
. CLR NGen . , NGen , JIT- .
. NGen , .NET Framework XCOPY .
(Rebasing). Windows NGEND, , . , Windows , . , Windows . rebasing : Microsoft Windows, 4- (Microsoft ).
.
, NGen can not , JIT-. , NGen.exe , JIT