You mentioned self hosting but if you want something without any lock in, there’s https://prose.sh/ — it open source, supports images, markdown, and you bring your own editor.

The reason I want to see a compositor comparison is because on Wayland the implementation really matters. This isn’t actually a x vs Wayland comparison, it’s actually x vs 1 Wayland compositor.

For all we know there’s a KWin perf issue that has nothing to do with Wayland itself.

Hmm it looks like they only tested KDE (KWin) compositor. I’d love to see how various Wayland server implementations impact performance since the compositor controls when it commits frames to the display controller.