If your web-site works slow when editing pages, please proceed the following steps:
- disable Ultimate Addons modules you don’t use;
- disable Readability Analysis from SEO by Yoast;
- ask your hosting provider to upgrade up to PHP 7;
- deactivate plugins you don’t use (that might be Layer Slider, GoPricing, etc.);
- deactivate post types you don’t use through The7 > My The7 > Settings > The7 Post Types and Elements;
- try using FireFox browser.