I run the site http://www.sirextiles.com. My dashboard has become incredibly slow. This has happened in the past. When I updated the theme it was fine. I think it is the same problem even now.
I had been using “Envato market toolkit” plugin to update my theme for the last couple of times. Now I cannot find the tab with update details in the plugin menu. I even tried to download the update manually from envato and upload it from Appearance>Themes>Add new. It is saying, CSS stylesheet is not found.