"With NGen, there can't be anything "lazy" about how generics are instantiated. Instead, NGen must create representations of every generics instance it could encounter. The CLR won't be around to JIT anything. So, after all the discussion of avoiding code bloat and taking advantage of CLR's run-time optimizations, NGen takes all those values and turns them on their collective heads."
Windows Phone 8 only runs native code. .NET IL gets compiled down to native
code when uploaded to the Windows App Store, by making use of an optimizing IL to
native compiler.
"With NGen, there can't be anything "lazy" about how generics are instantiated. Instead, NGen must create representations of every generics instance it could encounter. The CLR won't be around to JIT anything. So, after all the discussion of avoiding code bloat and taking advantage of CLR's run-time optimizations, NGen takes all those values and turns them on their collective heads."