Recently an issue came up in our forum regarding compatibility with TheGem theme from CodexTheme. If you are using this themes and have activated PageSpeed optimization in the setting then you will find that eForm takes forever to load in both standalone url and while ebbedding into the page/post. The reason might be broken HTML rendered by the theme for optimization.
Now to fix the issue, simply disable PageSpeed optimization setting available in the General tab for both desktop and mobile.