ASP.NET: Roslyn slow on page changes

Question

i have an VB.NET ASP.NET (4.6.1) MVC Application which is build with the new Roslyn Compilers.

Everytime i change a (vbhtml) File and reload the page it takes approx 9 s

Answer 1

The new compiler takes several seconds to start since it needs to JIT many IL assemblies. Ngen'ing the compiler and its dependency assemblies would help reduce the starting time. What you can do is to find the compiler assembly and do

ngen.exe install VBCSCompiler.exe
ngen.exe install csc.exe
ngen.exe install vbc.exe

You would need to run the above commands from an elevated console. And you may need to use the 64-bit ngen.exe if your machine is 64-bit. Normally the 64-bit ngen.exe locates in C:\Windows\Microsoft.NET\Framework64\v4.0.30319.