Yeah, it’s not as fast as I’d like, which is the consequence of two things: it’s running in JavaScript in the browser; and the subsector drawing is pretty tough on TiddlyWiki. There’s also an issue that opening or closing any tiddler forces a reevaluation of any open tiddlers, so if any of those are subsectors it will rerender them, which is slow. I’ve been trying to work out if it’s possible to materialise the rendered map to avoid a reevaluation.