IronPython 2 Performance on Different Platforms

In the DLR Talk at Mix '07, Jim Hugunin claimed a 12% improvement in performance between IronPython 2 and IronPython 1.

Seo Sangyheon ran some tests, and discovered that IronPython 2 is either faster or slower; depending on what platform it runs on...

IronPython 2 compared to IronPython 1:

 Mono 1.2.4+: -32%
 Whidbey: -21%
 WinFX: +6%
 MIX07 (Orcas?): +12%

This shows that IronPython 2 makes heavy use of some of the improvements in recent versions of the CLR runtime.