With the same toe file, I see a window bar in performance mode only with 099, when outputting the full resolution of a projector (1920 x 1080 for example).
No window bar when opening the file in performance mode with 088, or change the window resolution to 1920 * 0.95 x 1080 * 0.95.
Image 1: 088
Image 2: 099
Image 3: 099 (window resolution 1920 * 0.95 x 1080 * 0.95)
Image 4: Parameters of the Container for performance mode (I double Width in order to monitor different stuff on my laptop from the projector)