How you able to do this!!!

Really amazing. I am using WP Rocket and tried various optimization plugins. By searching other plugins I found this one, without much expectation installed (infact I liked the simple plugin description by author) and immediately I noticed the difference in Google page insight, pingdom, gtmetrix. I tested phastpress, jch optimize, perfmatters, autoptimize etc….but unfortunately none of those given this result. Even i tried nitropack but that tool also not given me the score which tbis free plugin given.
How you able to do this, Aleksandr Guidrevitch???
thank yoy very much
Vivek