how is it that the n800 can play high quality 400x240 video absolutely perfectly for as long as u want without it skipping a beat at all

but if u open any SINGLE image higher than 1024x768, it becomes super slow and struggles to zoom or anything? i put in my Canon SD1000's memory card in the external slot and it takes like 4 minutes to open one JPEG. is this just because its big? 2048x1536?

it cant handle one big frame but it can handle processing thirty high quality 400x240 frames in ONE second? wth!