Newer kernel and drivers for graphics cards. Fedora runs a more close to bleeding edge kernel, mesa, etc. whereas Linux Mint is based on Ubuntu LTS (Long Term Servicing) builds, so they don’t “rock the boat” as much with things like newer kernels as frequently.

Mint’s Cinnamon Desktop Environment also only supports the older X11 display server (Wayland is experimental right now) whereas GNOME and KDE desktops on Fedora default to Wayland. This translates to more modern and efficient window rendering.

Basically: Mint: “Just works. Don’t rock the boat. This will be stable into the heat death of the universe” Fedora: “Maximum speed and features at reasonable stability”