I’ afraid that WordPress will never be lightweight or even with good performance. Developers keep adding features and don’t care about user complains. This is why Habari Project[1] has been founded. It’s written in object-oriented PHP5, supports multiple database backends, and – most important – Importers for Serendipity and WordPress!
I think sooner or later everyone who likes to have high-performing websites should abandon WordPress and look for other, fresh blogging tools. ??
[1] https://habariproject.org/
