Why am I getting Google Page Insight errors for mobile?

[tomstarkuk]

I keep getting these errors in Page Insights, I don't understand what i need to do as I've resized the images for my collections multiple times to the point where they will be blurry if i downsize them anymore.

[oscprofessional]

Hello, @tomstarkuk 
Its Optimization Work So can you please Share Your Store Details I Will Check and Provide a Proper Solution

[tomstarkuk]

My website is: https://www.tomstark.uk