I had a similar experience at one of my customers, Delphi.
They wanted to speed up a machine which partially assembled heater cores.
My systems controlled the stepping of the machine, acceleration and deceleration.
The engineer’s goal was to take 5 to 10 seconds out of the operation cycle per minute which was easy to do EXCEPT all while I was testing the program change and parameter changes, the machine kept stopping BECAUSE THEY COULD NOT PRODUCE enough parts to keep the machine occupied.
So I asked them, are you going to modify, improve, increase production of the upstream process so you have sufficient product? NO! Was their answer! So I asked then why do you want to increase the wear on this machine to reduce its cycle time? Because my boss told me too.
"Make my winder run at 1800 feet per minute."
Can the downstream brand new casepacker load and process those numbers Jim?
"I'm sure it can, and do what I tell you!"
Now the winder stops in pause every three minutes because the casepacker is backed up.
Waste takes many forms. Most of which is human.