Mobile speed

The Jetpack Boost plugin shows my webpage performs poorly in regard to speed using the the Botiga theme. Is this a good theme for Mobile display? I have improved the site as best I can in terms of removing unnecessary plugins, optimising image sizes and have used optimising tools and settings to improve the use of code on the pages. Can you please recommend anything about the theme I can do to improve it’s performance?

The page I need help with: [log in to see the link]