nycore wrote: So wouldnt a 1000 x 1000 image take longer to process than a 100 x 100?
Not necessarily. The question is, IF the image needs to be processed. If you upload a 800x600-picture and set the limits to 1000x1000, the server doesn't need to resize it.
Also, the uncompressed (!) filesize matters - if that doesn't fit into the reserved memory, PHP can't resize it.
But don't ask me what to change on your server, that's nothing I know anything about.