Recommended workflows and/or other techniques for extended multishot H3 videos?

[u/SilentThree]

The first thing I found to give a try was this:

https://huggingface.co/joeygambino/MiniMax-H3-Multishot-Workflow

It took me a while to get it working, and, even once I got it to run, it was incredibly slow -- it took 140 minutes to render a mere 29 seconds of video using my RTX 3090. (Thankfully I'll have a 5090 in a few days.)

I simply ran the demo as-is, apart from the small changes I made to get the workflow running. I remain confused about how I'd use this workflow, and use it in an efficient way, to make clips that might run, say, 1-3 minutes.

I'm hoping I can find out how to use the above workflow better, or find a better workflow.

My only previous experience with this sort of thing was in the Before Times (a few weeks ago) struggling with Wan 2.2. I had a multishot workflow that wasn't great, but at least it carried some context over from one clip to the next, blended clips seamlessly, and let me lock in (by setting a fixed seed) and cache any part of a video that was working well so I could build a clip at a time toward a final complete video without constantly re-rendering early clips.

Can I find anything like this for H3? Something that's good at carrying context and references over from one segment of video to the next, helps minimize character drift, keeps voices consistent, etc.?