[Lizard]

There is a performance problem with screens that use the type of controls OmniFocus uses in the settings pane. Apple is aware of this issue and (hopefully) working to resolve it.

For the magnifying glass, I've seen similar behavior in several applications on the iPhone. Turning my iPhone completely off (hold the top button down and then slide the slider that appears) and back on again usually brings it back to its snappy self. Based on this, my guess it that something is hogging the iPhone's memory.