Update: PiMix has been discontinued since October 2021 due to very few downloads, and the release of Ubuntu 22.04. The Ubuntu Gnome desktop on 22.04 runs well on Pi 4 without any lag, and it is no longer necessary to use a lightweight desktop like Xfce.
Please try the official Ubuntu desktop if you need an alternative.
PiMix 21.10 is now available based on Ubuntu 21.10 (Impish Indri).(more…)