Have you ever used ngen.exe?

Question

Has anybody here ever used ngen? Where? why? Was there any performance improvement? when and where does it make sense to use it?

Answer 1

ngen is mostly known for improving startup time (by eliminating JIT compilation). It might improve (by reducing JIT time) or decrease overall performance of the application (since some JIT optimizations won't be available).

.NET Framework itself uses ngen for many assemblies upon installation.