I've been migrating my jEdit install for more than a decade now.. it's Java but the load time isn't terrible, I have a habit of leaving a window open anyway. It's rectangular editing mode is very useful, it has plugins, e.g. to diff 2 files, HyperSearch is like grep, you can even copy the list of search hits into the clipboard.

Maybe N++ has all these features, I use it too but haven't learned how to diff or do rectangular selection/editing.