Just chiming in to say that I'm experiencing the same issue with high GPU usage with the latest build of Launchbox. When the program is open and the window isn't minimized, my total GPU usage jumps to an average of 40%. In Task Manager, it says that about 25% of this is Launchbox and the other 15% is Desktop Window Manager. If I close Launchbox, or even just minimize it, total usage drops instantly to 0-1%.
I have a 3080 ti, and have been using it for about 15 months. I've been using Launchbox for probably two+ years. Last week, I reformatted my primary SSD and reinstalled Windows from scratch. I only just now noticed the GPU usage, so I'm not sure if it started as soon as I reinstalled Windows, or with the latest Launchbox update, which came shortly after. If it did start with my new Windows installation and not the latest version of Launchbox, then I wonder if it has to do with me now using Windows 11 instead of 10.
It's not a huge problem, because it doesn't affect gameplay (due to not being active on my screen), but I just wanted to mention that it's not just Wonderboy or their particular GPU.