Why artifacts may appear when working through the remote app?

Question

Windows

Client machine - windows 10. Server machine - windows server 2016. Shared via remoteapp 1s. Artifacts appear when working on one computer.
Because of what it can be, tell me at least the direction where you can dig?

Answer 1

And if not through RemAPP ?, but directly via RDP indicating the IP port. Also in the generated RDP file itself, you can reduce compression, extension, etc.