The interface was ruthless. No animated menus. No wasteful gradients. Just sharp, gray, mathematically perfect window tiling. It didn't use preemptive multitasking—it used , guessing which window you’d click next based on micro-movements of the mouse. In internal tests, "Optimum Chicago" could open Explorer before the double-click finished. Testers reported a strange sensation: the machine felt impatient .
Why was it killed? Not by bugs. By psychology.
Still waiting for the next thought.
Early human-factor trials at UIUC showed that users became anxious using Optimum. The system was too fast. There was no breathing room between intent and result. One participant famously said, "It’s like the computer is finishing my sentences, but for clicks. I don't feel in control—I feel chased."

