Flickering and performance issues when resizing windows

Some examples:
-Resize a task properties window. The spinner controls flicker. I figure that this is a symptom of double buffering not being used. (You can see both the control being cleared with white space and then re-rendered. You should only be able to see the final rendering result.)
-Resize a contact properties window. The performance is very bad.

Thank you for reporting this. We will try to fix it ASAP.