Video from my laptop to my 4k projector is not as smooth as it is on the laptop? Lenovo Laptop connected to Optoma UHD60 via HDMI?

The laptop is connected to a Onkyp system which is then connected to the Optoma UHD60 projector. The audio is good and clear, but the video isn;t as smooth in terms of frame transtiion as it is on the laptop. I understand that the colors will have a difference, as the laptop will always produce better colors. The length of my cable is approx 40 feet. Its a Blue Rigger cable.

Please advise what am i doing wrong?

Skip the Onkyo, shorten the cable to 6 feet.

I can't say for sure. But, if you're trying to display the video on both the laptop and projector at the same time, try turning the laptop screen off. That's going to be some combination of the "fn" key, and a key in the top row.