I just do Command+Q. After a couple of days it becomes muscle memory.I also recently tried switching to a Mac Mini M4 and I agree with @jazzy68, I'm not liking the experience compared to Windows, and I don't think it's just because I've been using Windows for years.
On Windows when I want to close something I can just instantly snap the mouse to the top right and click, whereas on macOS to close an app you have to go to the dock icon, right click and select quit. The quit button at the top left doesn't actually quit, and it takes longer than Windows to select anyway because it isn't at the very top of the screen.
I have the menu bar set to hide as well. It only shows when you mouse over it at the top of the screen. I just tried to see if I could recreate it like to say when switching tabs but it doesn't happen for me. I also tried using Control+Tab and it doesn't show then either so I'm not sure what is happening your end. Never really had an issue with the outline but fair enough.I dislike the menu bar at the top as you get less vertical space in a web browser, I tried hiding it which was even more irritating because it pops back up when changing tabs which changes the position of the tab. Another irritation is that there's an outline at the side of apps, you can only get rid of it by going into full screen which I don't like.
Can't comment on that. Chrome and Safari open reasonably fast on my M1 MBA with 8GBs of RAM. Are you sure you weren't using up all your available RAM and ended up swapping?I'm not happy with the general performance/snappiness of the OS either, benchmarks say it has blazing fast single core speed but it doesn't feel as snappy/responsive as a slower CPU on Windows. For example web browsers can take a couple of seconds to open which is instant on Windows, and there's a noticeable delay entering/exiting full screen in IINA video player during which the image is frozen.