Known issues

1. A long frame in the publish and icon pipeline. The main remaining source of lag: a frame of a few seconds. It needs pacing, as other pipelines in the client already have.
2. World generation is slow in the editor, under one frame per second.
3. Placing certain imported parts can crash the editor. The suspect is a large metadata parse inside a re-entrant resolver.
4. No dimension changes, and no End.
5. No online-mode authentication.
6. Player builds must not follow the import folder. A build that follows a link to imported content can bundle tens of gigabytes that must never be distributed, and can fill a disk.

Older items that were fixed and are worth knowing about: the join ordering bugs (see Joining a server), a quadratic catalog insert, and a registry that was never re-read behind the menu.