So for my animation needs I usually work with plenty of mid-res frames and I quickly faced Out-of-Memory issues on ComfyUI when it came to upscalers. So back in the days I made this sequential workflow for myself.
There is probably a smarter way or new nodes doing that by now, but it worked at the time for processing high resolution frames one-by-one just like in SD Extras tab, when no other solution existed (I'm open for up-to-date knowledge tho).
Otherwise I don't know, I guess people can find it useful to emulate a node-only "FOR loop" to adapt with other workflows that are memory consuming.
Anyway people in my Discord asked for it so here it is.
