I came in-game briefly to reflect on icons, and noticed that unless I moved my cursor periodically, the game would hang at the last time I moved it... so clicking on an icon, for instance, only worked if I then moved the cursor. Then reflecting only worked (after clicking) if I wiggled it again. If I clicked the icon and then clicked the verb (without subsequently wiggling my cursor) the action wouldn't occur until I did- the dialog box would just sit there.
If this is related to the performance testing, I apologize for bringing it up. It just makes playing impossible for me at the moment, so I thought I'd say something.