Non-blue grey. A lot of greys will have a blue tint. I like grey that doesn’t have that blue tint. I like it because it’s a neutral color that’s easy to match bright colors to, but it doesn’t feel dated like beige. If I had to pick a specific shade, I’d pick 50% grey, but I like a lot of greys.
It might be Mint or an issue with your laptop. I’ve been using Arch for a while and haven’t had major performance issues. Before I used Arch, I used Pop!OS and didn’t have any issues either. What are your laptop specs? Have you already looked into Nvidia Optimus? Have you tried other distros?