With Thymer we really care about performance, but Thymer is also end-to-end encrypted because we don't want to compromise on privacy. And it's real-time collaborative and offline first.
Thymer has optional self-hosting. Then you can upgrade (or not) at your own leisure, or intentionally stick to an older version you like better. Enshittification is a big problem in our industry. We've all been burned by it -- we certainly have -- and being able to opt out of a "new and improved!" version is a real feature.
Thymer will also be very extensible. Today we launched our plugin SDK: https://thymer.com/plugins and https://github.com/thymerapp/thymer-plugin-sdk/ with a bunch of examples. With Thymer you will be able to "vibe code" the very simple plugins and with VSCode/Cursor you can make more complex plugins with hot-reload.