How does image_lib perform under heavy usage?

[eluser]Derek Allard[/eluser]
Yeah, image manipulation is among the most processor intense activities you can do. Simple uploading shouldn't be a big deal, but if each the 1000 concurrent users is also trying to crop or scale an image... it'll bog a server down. This isn't a CI thing, CI just hands it off to the GD2 (or whatever) lib, the fact of the matter is that its just very processor intense.

What you may want to do is implement a system where jobs are que-ed, and the users are email notified when the job is completed.