Pharo Smalltalk
Smalltalk Performance
Updated Sept 24 2008: extract from old article.
One of the more popular classes in any OO environment is the Process class. The Squeak implementation of Smalltalk even has a special OSProcess plugin to the virtual machine ( VM ) that provides 'eyeball-to-eyeball' OS level support for threads. I keep trying to come up with big XML workloads to test the limits of the stdin/stdout channels.
Links - Pharo Smalltalk
March 19 2009: Pharo will be going beta with version 1.0 !!! I thought they said it would take three years ... glad it didn't :-).