I am talking about my own time and resources, not those of a computer - say, it might take ~one hour to come up with a solution for problem x. It might very well be not the best solution either, just the one that works okay (we've all been there). Or I could look up what other people have done in 2 minutes - say I'm comparing solutions too, that would make it 10 minutes. That's 50 minutes of work I can spend elsewhere. Much more efficient.