yeah this is not new was a recommendation from <a href="https:&#x2F;&#x2F;developers.google.com&#x2F;speed&#x2F;pagespeed&#x2F;insights&#x2F;" rel="nofollow">https:&#x2F;&#x2F;developers.google.com&#x2F;speed&#x2F;pagespeed&#x2F;insights&#x2F;</a> which I thought was now depracated, so must have been around for a while. I think it&#x27;s a recommendation of <a href="http:&#x2F;&#x2F;yellowlab.tools&#x2F;" rel="nofollow">http:&#x2F;&#x2F;yellowlab.tools&#x2F;</a> too which is great.