Needless complexity in software is something that gets on my nerves, especially on the web. We went from simple HTML to such a bloated mess that only like 2 web browsers can manage to keep up with it. I mean, does a web browser really need to do everything? Why use an office suite written in JavaScript in a web browser when there are native programs you could use?
30-40%, but depending on what I’m listening to, I may temporarily crank it up. I think this question kinda depends on sound hardware, though.