title: Is the og:image downloaded during a standard browser session? (aka does it affects performance?)
body: <p>The facebook documentation for Open Graph Protocol recommends a og:image of 1080x600 minimum (<a href="https://developers.facebook.com/docs/sharing/best-practices/#images" rel="nofollow noreferrer">https://developers.facebook.com/docs/sharing/best-practices/#images</a>).
  I'm pondering whether this will affect the performance of my pages on a regular browser visit, and whether i can do anything to optimise both og:image and page load speed.</p>