I used Shiny's withProgress feature for a long calculation: https://shiny.rstudio.com/reference/shiny/latest/withProgress.html
However, it simply puts the system to sleep and I have to wait for the Sys.sleep(xx) to finish before the calculations are actually undertaken. So I don't see the point of using something that makes the calculation process seem twice as long.
Is there some other progress bar approach that doesn't use Sys.sleep(0.25) so that calculations are actually occurring during the progress status display?