Thanks, but it seems I have been unclear.

My problem is that, all other things being equal, scrolling through a buffer in 
gvim is very sluggish using GTK+ 3, compared to using GTK+ 2. This is not a 
problem that affects other GTK+ 3 applications. My example using the output of 
seq was only to illustrate how slow the scrolling is. Maybe a better example is:

$ vim -g -u NONE -U NONE /usr/include/stdio.h
--> then hold down the 'j' key

The movement is slow, the display lags, and when you let off 'j' it keeps going 
for a second. This doesn't happen in Emacs or gedit (both use GTK+ 3).

Sorry for the confusion before. This is not about how vim reads shell output. 
It's about the display speed under GTK+ 3.

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