In a test i used webimageviews in 5 containercontrols with all together 780 pictures (each around 4 MB in size) resized to 5 different sizes for one of the containercontrols. The loading of the page took about 45 seconds. The containercontrols are scrollable and at the start of the loading you can see the filling of the webimageviews in the containercontrols.
Scrolling is very smooth on Internet Explorer 11, on the other browsers it’s less smooth, but still useable.
Double click on an image displays an increased size (ca. 800 x 600 depending on the original size) of the picture after the usual short lag because of loading over the net.
It certainly isn’t the fastest way to show pictures, a standard html-page will probably faster, but now you can use the images in an application combined with data from a database in a very flexible way.