So not using thumbnails isn't the main problem for slow speeds of some users, it's using a another photo hoster (Flikr for instance), that uploads at higher resolution.When images are uploaded to our server they are resized and scaled to a lower resolution. The mobile problem is most noticeable when you link to a large photo hosted elsewhere. We have no control over the file size but they still have to be downloaded onto the device.
Does everybody have that?