1. About the mouse: what did you try exactly and how did it fail? Can you share the output of `rfkill list`
2. About the RAM: yes. Windows sucks and uses a large amount of RAM for nothing. Linux is usually much note better for that.
3. If you don't want to go through the painful and endlessly process of configuring neovim, you may want to have a look at Helix (helix-editor.com)