That explains a lot. Literally <5k probably down to 2000 bytes, even configurable, would be fine for these thumbnails, scrolling is currently very janky. Unless the user individually requested a full size profile preview like Twitter. C# has brilliantly fast image resizing but that might only be due to Windows GDI. I made a 'facebook user profile image library' for a very similar problem years back. If there's a utility lib for Java/Android, these reduced images could go into a cache pool, and all be done in the client without a proxy online. I'm going library hunting.