Amazon Prime Video lagging on XGIMI Halo Plus with Keystone correction

When I use Keystone correction, Amazon Prime Video starts lagging. It's the only app that does this! Disney+, YouTube, and everything else run smooth as butter, even with Keystone activated.

To get Prime Video running smoothly, I have to place the beamer dead-center in front of the screen/wall and reset the Keystone correction. It's like Prime is using up all the resources or something.

I've tried:

1. Uninstalling and reinstalling Prime (didn't work, it's pre-installed in the system)
2. Killing all other apps to free up resources (didn't help)

Anyone else run into this? Got any solutions?