Hi mate,
GT Metrix update recently and change their Functionality
we are currently working on it to increase the demo rate
( all theme in ThemeForest has this issue )
However, we highly recommend you to use
a plugin for chase we suggested you autoptimize or W3C total cache :
Or
And you make sure all your images are optimized we suggested you use smush or ewww image optimizer plugins :
and also use CDN
we also enable cloudFlare CDN on our Website
Regards