It handled the load from about 20 computers hitting the page nearly simultaneously during the math report just fine, but I don't have any hard numbers and I didn't compare with GDGraph at all. I was in a hurry and needed something that did what I wanted with as little effort on my part as possible. GDGraph wasn't it. From how it handled that load though I'd expect it to scale up quite a ways before performance becomes an issue.

Makeshifts last the longest.