To little documentation…

I’m wary of the options in Optimiser because I don’t understand enough about what they do, how and why, benefits and risks. If I can just tick everything with no fear of adverse consequences then why offer about 20 choices? If everything just works surely all we’d need is a single “optimise” button. I infer that a single button might invoke some potentially deleterious actions, if so which? I need more information to be able to make informed decisions.