I'm using Tiddlywiki as well, but I haven't customized it much yet. Regarding your fear of it becoming slow, the good part is that you can manipulate the tiddl

I'm using Tiddlywiki as well, but I haven't customized it much yet. Regarding your fear of it becoming slow, the good part is that you can manipulate the tiddlers easily, so you could import them in another system, if you need to migrate.