I tried to improve my Google Page Speed Insights mobile score by optimizing images on the website. I analyzed the website a few times - when I didn't do anything and when I replaced some not optimized images what was supposed to make things better. Each time I got a different score. First it was 49 or even 34 (when I didn't do anything) and then when I changed some images I got 54, 52, 49 or 34. It doesn't make much sense. Why does this happen and what can be done to improve the score?
Why does Google Page Speed Insights show different score each time I analyze the website?
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In Page Insight there are Couple of Section "Score", "Field Data", "Origin Data", "Lab Data". The total score is based on all the four. If you optimized the code and run against page insight don;t look at score only see that was before and after the change in section "Lab Data". If your score improved in lab data you could see the total score go up after 28 days. In any case you don;t have to wait for 28 days instead click on the link "See Calculator" in lab data that will tell how your score look after 28 days.
From my experience tool is consistent the variation you are seeing are due to field data getting refreshed for your domain.
Thanks,