I am not a developer though I have worked along side many QA and performance teams over the years and would like to share a thought. There are websites that yo

I am not a developer though I have worked along side many QA and performance teams over the years and would like to share a thought. There are websites that you can point at your site to simulate the experience in many devices and internet speeds to get a rough idea of how your site will perform. I do not have any links handy since I am not a developer. Would it be more practical, pragmatic and actionable to set the goal to getting a passing score on something like 95% of the 90th percentile of most common devices so that you are not spending all your time optimizing instead of operating your business, accepting that you can not make everyone happy?