Driving Consistent Web Traffic with Automated SEO Systems
Developers can decrease filling times for existing images by implementing responsive images. If any of your pages are utilizing HTTP, you'll see the above recommendation.

Pages that load over HTTPS likewise use a more protected searching experience for your site visitors. When you link a domain to your account, HubSpot automatically arrangements a standard SAN SSL certificate through DigiCert. Nevertheless, if your website is hosted or partly hosted externally, you'll require to purchase an SSL cert from an external service provider to pack your pages using HTTPS.
If any of the resources on your pages are packing over an insecure connection, you'll see the above recommendation. Filling resources (like images, CSS files, JavaScript files, etc) over an insecure connection minimizes the security of the whole page. It can also result in browsers showing a combined material warning or obstructing the affected resources.

If your resources are hosted or partially hosted externally, you'll need to purchase an SSL cert from an external company to fill your resources using HTTPS. If you have already purchased an SSL cert from an external provider but your resources aren't filling utilizing HHTTPS, you'll need to contact your external provider to fix the concern.
GSA SER explained
External links that open a page in a brand-new browser tab utilizing the target="_ blank" attribute can cause security and performance problems. In some HubSpot modules like the Follow Me module, the rel="noopener" attribute is added to external links instantly.