This looks like a proprietary clone of TiddlyWiki[1] with a slower, clunkier interface.

[1] https://tiddlywiki.com/

I love TiddlyWiki. It’s the most useful software I’ve found in the recent years.

Ummm I've been personally using Roam for over an year. The interface is neither slow nor clunky IMO (maybe Tiddly is faster, but I don't want to solve problems I don't have). I have a graph with > 1000 nodes that I use to organize my reading. Not sure where the hate is coming from.

A good open source alternative is logseq: https://logseq.github.io/