With the following Microsoft Fixits

Enable:

Enable Hardware acceleration

Disable:

disable hardware acceleration

“Hardware acceleration is a new feature in Internet Explorer 9 that lets Internet Explorer move all graphics and text rendering from the CPU to the Graphics Processing Unit (GPU). In some cases, you have to enable or disable hardware acceleration to check for hardware or software compatibility issues with viewing certain Internet websites, such as websites that contain streaming or full-screen video.

Note Rendering is the process of using computer code to display the text and graphics that you see on your screen.”

Read more at the full KB article(KB2528233)

How to enable or disable software rendering in Internet Explorer 9

Get More help for Internet Explorer 9

Rob