Hello,
I saw the screenshot you attached.
1) The option you enabled opens the categories menu on the homepage. I have enabled it and it’s working. Please clear cache and check back.
Screenshot for Clarification: https://gyazo.com/d2adcf0e83884a071cc73963658666fb
2) Your issue has been Resolved. Please clear cache and check back.
3) In general, our theme is already optimized and doesn’t have too many resources to make your website slow. Most likely, your website performance suffers from the content you have added to your website.
It may happen in case of too many plugins, large not optimized images or other resources. So we suggest you remove unnecessary plugins, install some kind of JS & CSS optimizing plugins like Better WordPress Minify and a caching plugin like WP Super Cache. Also, you can use the GTmetrix tool to see what makes your website slow and optimize these parts of your website.
Best Regards