The Unity desktop in Ubuntu 13.04 supports a different rendering mode that will increase performance on lower specced machines. To enable this, enter the command below to create an empty file in the /etc/X11/Xsession.d directory. sudo touch /etc/X11/Xsession.d/99force-llvmsudo touch /etc/X11/Xsession.d/99force-llvm Then type sudo vim.tiny /etc/X11/Xsession.d/99force-llvm and enter this text. export UNITY_LOW_GFX_MODE=1export UNITY_LOW_GFX_MODE=1 Then press ESC …