RT: Page Speed Booster

I recommend this app. With another app I chose before, it wasn't as fast as I would like. I had a C grade on GTmetrix and 73/100 on page speed DESKTOP with 23/100 on page speed MOBILE. Now, I got a B grade on GTmetrix, with 78/100 on page speed DESKTOP with 43/100 on page speed MOBILE. Also, my largest contentfull paint is only 1.2 seconds. And I didn't do anything to optimize my images at all. I could be able to obtain something better.