In RS Production OEE, settings for performance loss allows to set different optimal cycle time for any combination of articles (products) and measure points (machines).
Go here to read more about Performance loss in general in RS Production OEE.
Standard speed loss settings
In Office tools, go to the Settings menu. Open Amounts and Speed loss, and use setting 9.1 to give Default optimal cycle time that will be used for all measure points (machines) not given a specific optimal cycle time.
To set different optimal cycle time for different measure points (machines), click the arrow down button on the right side and add details.
Article specific speed loss settings
Click the go to button on the right side to open the Article settings editor