Mine was set for 8G of RAM, but the experience was set to developer. I changed to only games and performance is indeed better. The mouse handling gets strange for swapping back and forth from the VM to the host and back, and the default full screen is a bit odd, but I guess for games, a person would want that. I normally don't have the VM full screen when working and I'm wondering if that might be the biggest difference.Mine is set to 8GB and System memory for GPU. I don't have anything else special on the config. Using latest dev build of Insider. It's also installed locally vs an external drive (sometime did this in the past.) I did set configure for to "Games Only" if that means anything.
I really wish Microsoft would sell licenses as I just got a reached end of service, and I don't think this build was even more than a week old, so another update and who knows what will be good and bad about it. I'm getting really tired of Windows Insider on both Arm and the x86 builds......