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From: egkle@mimsy.UUCP (E G K Lopez Escobar)
Newsgroups: comp.emacs,gnu.emacs
Subject: mode line moves (SLOWLY !) when scrolling?
Keywords: mode-line, scrolling
Message-ID: <15494@mimsy.UUCP>
Date: 17 Jan 89 17:27:52 GMT
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 47

Hello,

     I have a question about how GNU Emacs scrolls text in windows.
When I move point past the top or bottom of the displayed text in a
window, Emacs scrolls the text in the appropriate direction so as to
center point vertically in the window.  Most of the time it seems to
do this via something like the following (this particular sequence is
what happens when I have a single window displayed and do C-n with
point on the last line of a window):


    (1) the mode-line moves up to about the middle of the window
	"pushing" the text above it past the top of the window,
    (2) then the mode-line moves back down to its normal position,
	leaving blank space in the lower half of the window,
    (3) then Emacs fills in the blank space with more text from the
	buffer.

     This is all fine if I'm working on a fast workstation or a
terminal with a high baud rate, because it all happens so fast I
hardly notice it.  But in most situations, steps (1), (2), and (3)
take several seconds each, which is annoying when I'm trying to flip
quickly through my file.  The frustrating thing is that this doesn't
happen ALL the time, which makes me think there must be some way to
turn it off.  Sometimes, usually when I'm using C-v or M-v to do the
scrolling myself, Emacs just redisplays the text, without the
mode-line dancing around, and it happens much faster.

     Is there a way to tell Emacs do the faster scrolling all the
time?  I have checked the info pages for scrolling and controlling the
display, but I couldn't find anything.  In case it matters, I'm using
GNU Emacs 18.48.15 on a Sun workstation running SunOS 3.5, and I
usually run Emacs from within emacstool in Suntools, although it
exhibits the same behavior when run from within a cmdtool, or even
just on the whole screen outside of Suntools.

     If you reply directly, don't use 'r' or the address in the header,
because I'm not submitting this from my own account.  Use one of the
addresses below.  Thanks.

				Mark Phillips
				Department of Mathematics
				University of Maryland
				College Park, Maryland

				mbp@lakisis.umd.edu
			OR	mbp%lakisis.umd.edu@eneevax.umd.edu