My experience is that poor performance esp. memory use is often caused by bugs, and you can't predict the presence of bugs based on whether or not you think a feature is "bloat". Though you can simplify the UI I suppose.
Turning off random browser features only works if you accept that you'll break random websites and won't know why without debugging each one.
Turning off random browser features only works if you accept that you'll break random websites and won't know why without debugging each one.