So actually the rendering of the Revolution slider should not happen in the Builder itself. If there is rendering going on your installation please check the version of your theme and try to update the theme to the latest version.
Regarding the revolution slider itself, I suggest that you read this article regarding the performance of the plugin.
Finally, I suggest that you make sure that you have the latest version of the Revolution slider plugin which we support.
kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case if you still have problems.