Hello,
1) Provide us with server error logs and also FTP access to your site to check why your server is down once you visit the Static Block editor.
2) We include the Revolution slider plugin but additional addons and slider templates are available only if you buy the personal license of the plugin. The bundled version of the plugin comes without personal registration https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins so you don’t have access to extra features that offer plugin author for those who bought the personal license. To get access to those options buy the individual license of the Revolution slider.
3) Check these tips https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website to speed up the site.
Regards