Hello,
Thanks for using our theme.
The Core plugin is the required one, that contains the functionality of Theme Options, brands, and much more. GTMetrix changed its testing system, and all the sites that had A, B scores get C, E or F. Try to test your site here – https://tools.pingdom.com/ Also, read this article – https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website and topic – https://www.8theme.com/topic/speed-issue-with-theme/
Theme Options > WooCommerce > Single product page > Single product layout > Size Guide Image.
Regards
