[delinka]

Progress indicators that moving perfectly and steadily are probably time based, but I'd have thought they've always been work based. Example: you know you have to copy 20GB across the network; update the progress bar with 'percent of data complete' periodically (on a timer, in the byte copying loop, whatever.)

I've seen dual progress bars: one for "overall progress" (each one of five tasks fills this bar 20%) and one for the current task (maybe downloading, maybe unpacking, maybe copying, maybe waiting for hardware to reply...)

[nitrogen]

I've written progress bars that combine all of the above. Each sub-task had a weight though, and adaptive interpolation was used to animate the progress bar between chunky updates from less granular tasks based on how far they usually increment over which time interval.

[ohaideredevs]

We pushed "progress bar" data to the client via SignalR once x% of a slow moving process were complete.