Ubuntu 22.04 is the first release of Ubuntu that works well on the Raspberry Pi 4 without any lag or stutter. Most of the credit for this goes to the work done on the Mesa drivers over the last year by Igalia. The 2D graphics support and Vulkan 3D support for the Pi 4 are currently in great shape and continue to pick up improvements.

This article provides a few tips to improve the performance further.