I think you can scrap Microsoft there when it comes to their pc stuff and their mainly B2B stuff (dynamics and the like) As for the rest other than apple I think pageloads are an obvious metric to track and there's always going to be a contingent of their programmers incentivized to care about their code quality because slow code and the like runs on their machines at such scale that it often costs them a lot of money, same with uptimes of various services. Their amount spent on wages is comparatively very low.