Dictionary · OEE component
Performance rate
Performance is the second OEE component: actual output compared to what the line should have produced at its rated (ideal) speed during the time it was actually running. Micro-stops and slow cycles live here.
Performance = Actual output ÷ (Run time × Rated speed)
Performance losses are the invisible ones. A breakdown gets a phone call; a line running 8% under rated speed all shift gets nothing — no log entry, no alarm, no meeting. Nakajima's world-class floor is 95%.
Sources: Nakajima (1988) · ISO 22400-2:2014
Reading it on the floor
Where it hides
Two places: micro-stops (too short to log) and slow cycles (below rated speed, above zero — so nothing trips). Neither shows up anywhere except the arithmetic gap between rated and actual output.
First lever
An honest ideal cycle time per SKU. Then the gap math: run time × rated speed − actual output = units you lost without a single logged stop. That number usually ends the “our line runs fine” conversation.
The trap
Quietly re-basing “rated speed” to whatever the line currently does. Performance then reads near-100% forever and the metric is dead. Rated speed is a design fact, not a rolling average.
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