Selecting "UYVY Colormode" changes the format of the color values that are passed around internally for processing inside Maxi-Patch from ARGB (alpha-red-green-blue) to UYVY (YUV 4:2:2), a chroma-subsampled format which actually only requires half as much data to transmit the image. The net result is that for formats such as .dv in QuickTime which use UYVY as their native color represenation, only HALF as much data needs to processed and shipped out to the graphics card. This should give you a very nice increase in overall framerate when playing movies that have UYVY color representation.
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