Internet Explorer's Compatibility View is a feature which affects how it displays web pages in Performance Canvas.
To remove Performance Canvas from Compatibility View:
1. Open the "Tools" menu (Alt+T) and select "Compatibility View Settings"
2. If your Performance Canvas site is listed under "Websites you've added to Compatibility View:", select it and "Remove"
3. If your company is hosting Performance Canvas on a local intranet, un-check "Display intranet sites in Compatibility View" & "Close"
4. Restart IE.