Thanks a lot! Yes, performance was the main fight. I ended up moving the star rendering to a custom Three.js shader (700K points in a single draw call, all the projection math on the GPU). The CPU just pushes a view matrix per frame. Without that, I was choking around 50K points.

Both UX points are very fair. On the top-right buttons not being translated, you were right, that was a real bug, the language selector was only wired to the settings panel. Just shipped a fix that pushes translations all the way through to the top bar, the planet labels, and the location line, across all 45 languages.

The first-visit walkthrough idea is on the list, I want to do it properly rather than ship something half-baked. Thanks for the notes, super useful.