Using brand new high end commercial grade LG 75" monitors. When chromecasting desktop from laptops the experience is poor. Image quality pixelated and overall image quality is bad. Steaming direct on the TV using the Chromecast device is great. It's when casting the desktop.
Thanks for reaching out. Let's sort this out.
A few question: are you using a Chrome browser? What's the OS version of your laptop and its make and model? When did the issue start?
Give these steps a try: