In theory you should be able to get the natural height and width of the image before loading it. Not exactly sure if it works with SVGs but it does work with PNGs
You can use preconneft tags to make the browser preconneft to the likely source of the images. This usually gives a pretty big boost in speed because browsers will have already connected (DNS + TLS handshake) to the icon source's CDN.
I only force the height for the logos, not the width, so wrapping doesn't really improve things.
Waiting to display until they are all loaded kills the "instant" tagline. I'm hotlinking the images, so some images can take awhile.