Experiencing similar slowdowns running the LibreOffice 7.2 snap on Ubuntu 21.04. After clicking on a cell, it takes ~1.5 seconds for the display to update and show the cell as highlighted. Text doesn't appear for ~1 second after being typed. All the while the Xorg process is pegged at 100%. Also stuck using Nvidia proprietary drivers on this machine.
Experiencing similar slowdowns running the LibreOffice 7.2 snap on Ubuntu 21.04. After clicking on a cell, it takes ~1.5 seconds for the display to update and show the cell as highlighted. Text doesn't appear for ~1 second after being typed. All the while the Xorg process is pegged at 100%. Also stuck using Nvidia proprietary drivers on this machine.