I updated my HD6950 host to Catalyst 11.6. And observe huge (!) performance drop
Not a lot data collected (because all so slow!), but...
here plot for AP:
For MultiBeam app situation even worse - both CPU and Elapsed times increased.
EDIT: I did few more AP tasks now and see some correlation: If CPU time lower than with 11.2 - Elapsed time greatly increased. But there were tasks with same values as for 11.2...