Hello David
Yes that is correct – If you take a look at the GTmetrics you will see that not specifying a height tag on images will be causing problems – impacting your page speed load and is an issue that should be fixed – you can read about that here
https://gtmetrix.com/specify-image-dimensions.html
Information about this from Google
When the browser lays out the page, it needs to be able to flow around replaceable elements such as images. It can begin to render a page even before images are downloaded, provided that it knows the dimensions to wrap non-replaceable elements around. If no dimensions are specified in the containing document, or if the dimensions specified don’t match those of the actual images, the browser will require a reflow and repaint once the images are downloaded. To prevent reflows, specify the width and height of all images, either in the HTML <img> tag, or in CSS.
Regards
Steve
