Scrubbing image media source is lagging. (pre cache problem)

Hi guys,

Im trying a simple interactive turntable by scrubbing through a sequencer timeline with an image media source.

What ever setting in pre roll post roll cache size, behind cache ect. its laggy as hell and i think its because at no time all images are cached.

Especially when i jump from last to first frame or the other way around, i need every single image loaded.

Its a basic thing at least in unity, so there must be a solution, any ideas ?