Running Multiple Packaged Builds at Once

Hi Everyone, I’m trying to run multiple instances of a packaged build simultaneously, and I’m noticing that the framerate drops per instance as more are added (1x: 120fps, 2x: 60fps each, 4x: 30fps each, etc). Is each added instance splitting my GPU resources or something? Is there anyway to make sure I maintain a certain FPS even as more are added by pulling more GPU resources?

Linux 5.4.4, 4090 GPU

Thanks!