Saucer Boss review for Booster Page Speed Optimizer

My site's theme is a little bloated and I saw this app. The ONLY reason I gave it 2 stars is because their UX is so fun. It was simple and rewarded me with confetti for clicking a button! However, I cannot recommend this product as it actually lowered my site's score on Pingdom (75 to 74) and PageSpeed Insights (33 to 25). From what I can tell, it added .1 seconds to the load time. I would love to love this product, but cannot. But their development team has done a great job with the UI so while I cannot justify using the app I genuinely enjoyed it for the brief time that I did. I should also add, their response to this issue (slowing page load speed) is boilerplate and does not address the issue. If "page speed apps such as pingdom or gtmetrix will not show any improvements when the app is installed" then how do you recommend we gauge performance? If this app does what it claims, how can we verify the results?