The issues is that probably you don`t know when these files are causing issues ofr your site. Google has announced today that Webmaster Tools now include a Blocked Resources Report to help webmasters identify these issues.
This report will show where the blocked resources are and will reveal list of blocked resources with the pages where they are embedded. This report will guide you through necessary steps to resolve this issue.
Why these files are so important?Fetch and Render tool shows why it matter. When you submit URL, it will show how the page looks to a regular user and how it looks to This will help you identify any blocked resources on your site.
Have you checked your Google Webmaster tool to find out blocked resources? What other methods do you use? If you have any question, feel free to ask me.
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