Hi,
2.2B was compiled with ICC 9.1.x (most current release at the time) and IPP 5.1.x (same).
We've recently experimented with later ICC 9.x and 10.x releases as well as later IPP 5.1 and 5.2 releases. So far, it looks as if ICC 9.1/IPP 5.1 is quicker than any other combination still, though I'm still not quite finished with testing.
HTH,
Simon.