"Create Data Binding" menu response time.

My installation of VS2012 is specifically slow when trying to create data bindings using the properties pane.

For instance, I have a XAML definition like this:

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525"><Grid><Label /></Grid></Window>

Clicking on the <Label /> token, I go to the Properties pane and click on the selection box next to the "Content" entry. This calls up a menu. Selecting the option "Create Data Binding" results in a delay of three full seconds before the binding dialog comes up.

This wouldn't be so bad, except that the delay scales up. The XAML I'm actually working on is 1000 lines long. It's part of a complex user control. On that one, "Create Data Binding" takes about 45 seconds to appear.

What's going on, and how can I make the system respond faster?

-- Rob