Say we A-B tested user reactions to completing some task (e.g. transferring files, restarting their device): would people be quicker to get impatient/ annoyed if they got random percentages as indicators of progress, or if they had a steady, accurate progress bar? What if it was steady but NOT accurate? When would people experience the most intense emotional drops or rises? Would the slot machine effect play a part, i.e. would the chance of getting a "big" leap (21% towards update installation!) keep users waiting patiently during the slower progress intervals?
This question is based off a wandering thought while my laptop was restarting recently, as well as some basic psych understanding. I can certainly see it being possible that people would, on average, be more willing to wait for a 2/3/8 min update with erratic progress than 1/2/5 mins with steady progress. I'd be interested if anyone knows of such/similar studies and, if so, what conclusions they reached.
Edit: internet legend Tom Scott came through and discussed this topic recently, https://www.youtube.com/watch?v=iZnLZFRylbs!