And how did you measure this? I don't mean the decoding the picture and writing it to memory... that is pretty much as fast as regular pictures. The slowdown comes from the copper banging the colour registers, for the whole duration the picture is displayed. With stock A500 this would take pretty much all time from CPU, especially when combined with the highres 4 planes DMA drain...
And on a stock amiga you normally run a bunch of programs at the same time you are watching still photos? I sure as hell would be interested in this if i knew about it back then.
I honestly dont care if the cpu and co processors is working at 90% capacity when i have nothing running in background that needs the power.
