I added a 71KB JPG to a web project, then added the WebImageView to the page, select the picture and when I run the project the image URL point to a PNG file that is > 1,200KB.
My guess is that Xojo is converting the Picture into a WebPicture.
What is the correct way to avoid the conversion? just upload the JPG file to a web server and use URL option instead of Picture (in WebImageView Behavior)