I think it's amazing how deep you can go in something as simple as rendering diffs, and I'm really grateful you shared that writeup (in fact I've been following you loosely since the Kiip days as a then aspiring designer+developer type).

I've always been curious how products like ag-grid are able to allow you to lazy-load 10,000,000+ rows in a table without the blanking you described, and I imagine this type of method describes how it can be done.