I have to strongly disagree here. Celeron 3.0 GHz and 1 GB of ram wouldn't even open some of the design files we work with. We are finding wrap files getting over 6GB in size (Photoshop). It take our systems a while to open them. I can't imagine trying to work with those files on a system like that.
I would have to guess that you are working with relatively small files and have a great deal of patience.
I guess it comes down to how productive you want to be.
You are correct that it comes down a lot to the type of work and files that they are handling, and most of them are relatively smaller jobs yes. But even with larger files they haven't had much noticeable problems. I am with you, however, in believing that these computers are definitely ready for a replacement and I know it would help to not only speed up work in designing large files, but open the door for working on larger files as well with less headache. Unfortunately, all of the people in that office have a very collective mind that, "If it ain't broken, don't fix it." Well, it's true that it's not broken yet, and while we have the other expenses this year of putting in file servers, a couple new design systems, and a new RIP system, these computers are still CAPABLE of doing all their design work, though far from ideal of course. This is all that I meant really, these computers are CAPABLE of doing what they need, but just barely.
I recall Techman commenting that he did some work still on an older P4 system, if I am correct. I'm just saying that these systems, while not ideal for running FlexiPRO and Illustrator CS3 and Photoshop CS3 all at the same time with ease and comfort, it is still possible to do all you need on these systems.
Some older systems still can do a lot of tough work, more than you would expect. Some of the older computer systems they used here at the School of Engineering at the University of Kansas where I work were based on a single-core Xeon 2.4 Ghz processor with (at best) 1 GB of memory and a 64MB nVidia Quadro NVS560 video card. They still can handle doing autoCAD and complex MathCAD and other intensive applications as needed. Granted, not as well as some of our newer Core2Duo 3.0 Ghz 4 GB memory nVidia Quadro FX570 systems, but still capable.