I attempted a home Linux machine about 7 years ago and had to give way over family needs. I'm now running mint on the next iteration of the family computer.
When I Gacha, I prefer to find the specific community surrounding it.
I suggest starting the community you want to see and posting your accomplishments as you go. This is coming from someone who misses their mobile game community.
I see a couple of people suggesting that you use a KVM. If you go that route, make sure you get one that matches your refresh rate, or you will be stuck at 20-30hz.
If you have the ports, you can connect the computers via different ports on the monitors and use the monitor buttons to swap between. A KVM would still be useful to move the mouse and keyboard.
As kolorafa said, writing at a lower speed might help.
Also, how is read performance on the optical drive? Could you try a commercial disk to see if it plays well?
If you made basic changes to your boot order I can't see it causing performance issues with the drive. I can't think of any settings that would cause issues.
My thought is more that there might be a bottleneck for the drive. In Windows a hard drive at 100% utilization slows down the system. I don't know what kind of drive op has, but poor perform would be displayed in the performance monitor.
Also, if they are playing games and the network is saturated, they would experience network performance issues.
Without being there to watch and understand your process, I have to assume you know what you are doing and haven't missed a step in the writing process, such as finishing the disk or whatever. The fact that you are using multiple applications on multiple operating systems lends confidence.
That leaves the hardware itself. Luckily a new writer isn't expensive.
You can also delay startup of certain applications, if you wish.