That's a running theme in Ubuntu, where much of what makes it great are small changes and new features that individually might not be remarkable but all together create a system that is fast, stable, and hard to beat. There's also a major kernel bump, and considerable work has gone into improving and polishing the default Yaru theme. This update has been very solid in day-to-day use, and it still manages to (optionally!) include support for some cutting-edge new features, like the beginnings of a tool to manage ZFS snapshots. The good news for Ubuntu fans is that 20.04 has been a fantastic release in our testing.
Further Reading Ubuntu 19.10: It’s fast, like “make old hardware feel new” fast