Comment 1 for bug 1752167

If my memory serves me right, many of the more lighter desktop environments in Linux, such as LXDE and others, aren’t making use of your graphics card full potential by avoiding using a compositing window manager.

I'd recommend you to install Compton, it is a lightweight, standalone, compositing manager software for the X window system, it adds nice effects together with smooth display rendering that may enhance your display performance and should fix your problem.

Open your terminal and type in the following command:
sudo apt install compton

Now for the configuration, here’s an example file I use myself https://pastebin.com/y79QS4uC , the file needs to be stored inside .config folder and be named compton.conf (/home/<USER-NAME>/.config/compton.conf).

Hope this helps