There is an experiment introduced by Klaus Leopold in his book Practical Kanban (Recommended reading for PSK Cert) in Chapter One where he folds paper boats to show the improvement in Cycle time and other improvements by limiting WIP. A video of the demonstration can be seen at the link at the bottom with reference points. He demonstrates building ships with an unlimited Push system and a Pull system with a WIP of 1 for each stage shows a much lower Lead time (he calls it lead) when he tabulates the results (see below).
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