With AIS 6.0.1125, my QQ under Windows 7 get terrible delay each time a windows is open.
Some times, I have several messages at the same time and my system freeze for few seconds.
Therefore, I move back to 6.0.1091 which runs a little faster.
Last afternoon, I upgraded to 6.0.1184 and I was amazed that the speed comes back.
Now, the message boxes open much faster. No more terrible freezing.
However, I have not seen anything about this in the changelog.
So, I wonder if that is a special case with me or does Avast really solved the freezing problem.