.NET 4.0 vs 3.5 runtime performance

Question

Now that VS2010 is in RC it seems it's only matter of weeks until first new 'core' runtime release since 2.0. Whilst I do not have immediate needs to upgrade I'm wondering if anyone has done some performance testing/benchmarking between the two.

If there are any noticeable performance gains then it would be beneficial to recompile existing, working, applications.

TIA, Dejan

Answer 1

ASP.NET 4 Runtime 
      o Focused on two areas
            + Performance
            + Extensibility
      o New resource monitoring options
      o New performance features
            + Session state
            + Improving perceived application startup
      o Output cache extensibility

Check this link http://ecn.channel9.msdn.com/o9/pdc09/ppt/FT57.pptx