This image is blocking the rendering of your website 5.0MB is really long to load on mobile devices. https://s3-eu-west-1.amazonaws.com/olz-web/welcome/masthead

This image is blocking the rendering of your website 5.0MB is really long to load on mobile devices. https://s3-eu-west-1.amazonaws.com/olz-web/welcome/masthead-dark2.jpg https://s3-eu-west-1.amazonaws.com/olz-web/welcome/masthead-... First it should be compressed better. Then it should not block the rendering of the page