Thanks for providing your url. This issue is not because of Pro theme or the editor. This is because of your site itself. I made some further investigation and I found out that your homepage is 27.1MB with 121 server requests. This is a lot to load in the browser. To load all of these, it will take 22.85 seconds. Please check out the test results from here:
To improve your site's performance, please check this out:
Hope this helps.