Thank you for using our theme!
Read this post about site speed https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website
Disable unnecessary third-party plugins, install and use cache plugin, optimize images.
Also, you can find optimization settings of our theme in Theme Options > Speed Optimization. Enable Lazy loading for the images there.
For the home page I would recommend you enable Lazy loading for the Products elements.
Contact your hosting provider about the Memory limit issue. We can do nothing with that. So, your hosting provider will be able to increase the memory limit and check which plugin uses all your memory.
