> >   However, is it true that this progress may not be relevant much as
> >  other part of project loading will spend more time?
> 
> You definitely notice it on the XO with 1mb+ files.

  Yes.  Takashi reminded me that the #upToEndProgressBar in
ReadWriteStream was when we were showing stacked progress bars.  Now
we only show one bar (that goes back and forth), it makes perfect
sense to apply your patch.

  Thank you!

-- Yoshiki