Diplomacy screen slow to open/close at high resolution

[stephanmeesters]

Prerequisites

• I have searched for similar issues and confirmed this is not a duplicate

Game Version

• Command & Conquer Generals
• Command & Conquer Generals: Zero Hour
• Other (please specify below)

Bug Description

Opening and closing the communicator window is very slow when using 4K. It's good at 800x600.
At 4K the communicator button also is less responsive (see video).

Doesn't appear to depend much on PC speed, I recorded this on my old Windows PC but it's also slow on my very quick PC.

Reproduction Steps

Set resolution and click communicator button see videos

Tested using weekly-2026-01-16

Also tested using Steam version, it's a retail bug

Additional Context

800x600:

communicator-slow-800x600.mp4

4K:

communicator-slow-4k-small.mp4