[i]Re the 3.5GB of Web space: That is most assuredly not "memory" aka RAM. It is Disk storage.[/i]
I assumed that is clear. I just mentioned it because with 140,000+ images he very well could run into disk space issues with all the thumbs etc. even if the images are not that big itself.

That's why I asked about how much is used.

PS: I fixed the 1.4.4.7 version in your post :-)