Release 73 adds copying speed and completion time estimation for longer file copies. To toggle between the views just click on the text next to the progress bar.
The estimation is calculated in three steps.
First, the app looks at effective copying speed and uses sliding window to average it across last 25 samples taken 650 ms apart.
Second, it uses this average speed and the remaining byte count to approximate the completion time.
Finally, the completion time is averaged with its own sliding window, but using only 4 past samples.
This double-averaging helps mitigating the effects of sudden short-lived I/O bursts and hiccups on the estimation.
The parameters - 25, 650 and 4 - are configurable through the engine .ini file, so the whole thing is open for tuning if needs be.