I switched my XFCE machines over to use Compton for window compositing today - and it’s a noticeable improvement.
A compositor glues your stacks of windows together to form the final image that you see on screen. It’s responsible for any fancy effects like drop-shadows, as well drawing windows while dragging, resizing and minimizing or maximizing them. 
Compton does this beautifully. It does one thing and it does it well. It provides glassy smooth, tear free compositing and ...