Hello,

01. 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 WP Rocket. You can find our guide about how to optimize your website built with our themes here https://space.xtemos.com/wordpress-performance-optimization-the-ultimate-guide-in-2021

02.Please read the following article for help in fixing the issue:
https://developers.google.com/maps/documentation/javascript/error-messages#referer-not-allowed-map-error

03. I have checked your site and the accordion widget is working fine on your contact page. Check back your site after completely clearing the browser cache.

04. It is an issue with your custom css code that you have added in the Global custom css area. Please add the code for a specific issue and check how it works.

Best Regards.