Can the size of the og:image affect the webpage download speed?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  David Kutcher: The image is not downloaded as a necessary asset of the page.
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  Jody Nesbitt: no, it wont
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  Neil Cheesman: Just trying to get my head around it - why does gmetrix and webpagespeedtest etc show the image having a download time when the `not-visible` image doesn`t affect download time? Obviously they are not the end user viewing the web page but doesn`t that then throw out page speed that is displayed?
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  Paul Thompson: Hard to tell without actually seeing the page in questions.... But if you`ve hidden the image with CSS it will still download on the page. If, in fact, you`ve written an alternate image for the Open Graph tags (for example using Yoast SEO`s capability for this), then the OG image will simply be an external link on the page.
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  Paul Thompson: When I look at the waterfall for both webpagetest and GTMetrix, the only og-relatead image that is loading is https://www.londontheatre1.com/wp-content/uploads/2018/02/Moormaid-og-800x418.jpg and that`s because it has also been used as the img src for the Pinterest image which is using display:none to hide it on the front end. As I mentioned originally, such images that are just hidden by CSS do get downloaded and count against download time. https://www.webpagetest.org/result/180215_2C_d593c17beae7fe8c9e9471b0b900cbb2/1/details/#waterfall_view_step1