Here is the Page Speed Insight: https://developers.google.com/speed/pagespeed/insights/
I sometimes run my website on it but ALWAYS get the same result. However, I used to think this is very reasonable because I have the same website code so every test would get the same result.
But why doesn't Google ask for a test location? For instance, on https://www.webpagetest.org/ it would ask you from where do you want to test the speed website.
Why not Google Page Speed ask that? If I get a low score, does that mean I only need to take care of my code and there's nothing to do with my server location?
FYI: I have this confusion after testing my web page with webpagetest.org and the score is almost perfect with Japan testings while very normal with US testings.