Thanks Nancy! One of the pages on my portfolio/website contains a large number of images, and that's what's causing this issue on that specific page. The other pages are working fine. Adobe support' has advised me that they are working on optimising Adobe Portfolio’ to be able to handle a larger number of images, moving forward. For now, I have to lower the number of images per page, in order to resolve this issue…
Too much bandwidth is never good. It can significantly impact page performance and cause failures especially on restricted mobile data plans.
I choose media carefully and optimize images for the web in Photoshop before uploading them to Portfolio. Photoshop's File > Export > Export As panel (see screenshot) can help you bring down file size without sacrificing much on image quality. On gallery pages with multiple cover images, every little bit helps.
Nancy O'Shea, Adobe Product User & Community Professional Alt-Web Design & Publishing ~ Web : Print : Graphics : Media