Is ASP.NET with .NET 4 faster

Question

I'm looking to upgrade my ASP.NET web app to the .NET 4 framework. Would I see performance improvements right away?

Answer 1

According to this blog post, there are supposed to be internal runtime improvements that should help out of the box.

According to Microsoft, there have also been a number of invisible performance improvements in the internals of the ASP.NET runtime that should make ASP.NET 4.0 applications run more efficiently and use less resources. These features come without any change requirements in applications and are virtually transparent, except that you get the benefits by updating to ASP.NET 4.0.

There is a PDC presentation (which I cannot currently find) that claimed the same thing. I would assume that YMMV depending on your implementation, in any case.

Obviously ASP.Net 4.0 will benefit from any areas of the .Net 4.0 runtime on which it depends that are improved. It's usually safe to assume that a new release will make things no worse...

Answer 2

A lot of the performance improvement is probably in development. A lot of things have been improved like handling of ID's so Javascript can interact better with controls. And some C#4.0 features like the dynamic object and it late binding. Here is a list of all the benefits ASP.NET 4.0 Have:

http://www.asp.net/learn/whitepapers/aspnet4