Dawn of War 1 Low FPS when infantry move

This is specifically in Soulstorm

Whenever there is a large number of infantry on the screen the FPS drops dramatically when they begin to move. Sometimes into the single digits. Framerate is at 144hz during gameplay otherwise. When infantry stand still there is no problem.

I installed the 4gb patch, but that did not work.

I have encountered this problem on two different laptops.

I use Linux on both machines and run the games through Lutris.

Laptop 1:

Pop OS

Ryzen 5, 16GB RAM

RTX 4050 @ 144hz

Laptop 2:

Kubuntu

Core i5, 12GB RAM

Intel HD Graphics 620 @ 60hz

Any help would be truly appreciated.