For the longest time my Google Insights page has been sitting at a score of around 54% for mobile and around 87% for desktop which always baffled me as it is only a simple site. I have previously used lightspeed which helped slightly. I was about to pay someone to review my site to improve the performance when I came across WP Rocket. Holy Moly after I installed and turned on a few basic settings my site is now running 99% for both Mobile and Desktop.
Thank you for your valuable input!