Every time I test my client's sites on PageSpeed Insights, my images really really slow down my site. I've gone through the process of making them as small as possible without loosing quality and I compress all of them on Tiny PNG. However, my page speed is still suffering. I think it would be cool if when you upload an image, Webflow uses the <picture> element instead and automatically makes copies of the image in jp2, jpx, and webp. This would really help with site speed and the technical side of SEO.