As I understand they needed to download images from any external servers using an URL. I am not sure if that is possible even with CORS.
Also they don't save preview images and generate them when needed as I understood. So what you are suggesting requires a lot of disk space to keep thumbnails that might be never needed later.
And if you don't have millions of uploads per day then it makes no sense trying to save some seconds of CPU time by unnecessarily complicating the system. In most languages there already are libraries for resizing images.
Also they don't save preview images and generate them when needed as I understood. So what you are suggesting requires a lot of disk space to keep thumbnails that might be never needed later.
And if you don't have millions of uploads per day then it makes no sense trying to save some seconds of CPU time by unnecessarily complicating the system. In most languages there already are libraries for resizing images.