Illdy PageSpeed Insights mobile issue

I am working on Illdy and this is a great theme, but I am struggling with the mobile speed performance test. It just keeps rating me under 30 points. It is very annoying. And desktop test is right now 97! What can I do to make the website faster for mobile?
I disabled preloader and I am using W3 Total Cache already.


I hope you are doing well today.

You can use the following plugin to optimize your images:

Another option is to have your hosting provider upgrade your PHP version to 7.0 or higher.

Best Regards,