If anyone is noticing that their Adobe Flash video streaming is stuttering. Uninstall this update below. This worked for me on both Windows RT and Windows 8. You can go to Check for Windows Update and hide this update if you don't want it automatically get installed the next time.
Update for Internet Explorer Flash Player for Windows 8 (KB2957151)
Update for Internet Explorer Flash Player for Windows 8 (KB2957151)
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