Most progress is determined by a multitude of factors, network speed, device speed, RAM size etc... And even some things that are unknown to the process; server

Most progress is determined by a multitude of factors, network speed, device speed, RAM size etc... And even some things that are unknown to the process; server load, problem complexity, problem size...etc. It's just easier to lie! A good solution is to have a progress bar that goes for a certain amount of time 0->10 seconds. But if it finishes earlier, then it quickly jumps to 100%. Still a lie, but it's satisfying to watch and accurately finishes every time (so it's harder to spot the lie).