I’d like to inform myself about the difference between the UTXO and UTXO-HD, currently in development, model. Has anyone got a link regarding this?

mempool refactor … if you are a developer then checkout github for issues, commits, code, etc. If you are not a developer then the shorty version is it is mostly about performance.

P.S. Refactoring is arguably the most important aspect of software development in reducing technical debt burdens over the long term …