EagleFiler normally enables JavaScript when importing Web pages so that it archives the page as it would be displayed in your browser. However, some sites use JavaScript in a way that makes the page content not fully load if there is no user interaction. Others use it to display advertisements that can make your archived pages much larger than their actual content. And sometimes JavaScript triggers an OS bug that makes the import hang.
EagleFiler has an advanced setting that lets you disable JavaScript for certain domains where you find it to be a problem. To set the non-JavaScript domains, enter a command like this in Terminal:
defaults write com.c-command.EagleFiler WebToolNonJavaScriptDomains -array discourse.omnigroup.com meta.discourse.org forums.swift.org
Note that disabling JavaScript will also prevent some non-advertisement content from loading, such as comments from Disqus. You may or may not find this desirable.
To re-enable JavaScript for all domains, enter this command in Terminal:
defaults delete com.c-command.EagleFiler WebToolNonJavaScriptDomains
To disable JavaScript for all domains, see EnableJavaScriptForWebTool in the esoteric preferences.