Just a quick note about image compression: don't recompress JPEGs unless you really have to.

JPEG uses a lossy compression method, throwing away the things that humans are unlikely to notice anyway. But doing that with an already compressed image will degrade the quality of the image heavily. Doing it in multiple steps... not good :/

So if you need a smaller file size, try saving the uploaded file with increasingly worse quality settings until you have a sufficiently small file, don't use the already recompressed image as a base for the next round.

/J