如何在循环JSON中为php内部的循环制作更高效的js

I'm selecting values from my db in mysql and comparing them with values from JSON. I'm receiving the right results but since I'm using append the results shows up one by one, which looks like animation I would like to get them all at once and show some kind of loading icon while the loop is running, I've tried few different ways but nothing worked.I'm selecting values from my db in mysql and co