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Re: screen vertical split speed vs dvtm

From: Erik Falor
Subject: Re: screen vertical split speed vs dvtm
Date: Tue, 29 Dec 2009 10:50:59 -0700
User-agent: Mutt/1.5.20 (2009-06-14)

On Thu, Dec 24, 2009 at 03:37:04PM -0500, Sadrul Habib Chowdhury wrote:
> * Chris Jones had this to say on [24 Dec 2009, 10:42:38 -0500]:
> > On Tue, Dec 08, 2009 at 04:33:30AM EST, Sadrul Habib Chowdhury wrote:
> > > * Chris Jones had this to say on [08 Dec 2009, 03:40:31 -0500]:
> > > > On Mon, Dec 07, 2009 at 11:08:02PM EST, Sadrul Habib Chowdhury wrote:
> > 
> > Hello Sadrul,
> > 
> > I have switched my regular screen environment to the new version and now
> > that I use it all day, I can't help but notice the constant flickering
> > when I enter text or scroll the display.
> > 
> > This is even more noticeable when I run vim with a white background,
> > where I see streaks of black flashing by as I scroll up or down the
> > display one page at at time.
> > 
> > I don't know if this is particular to my setup or if anyone else sees
> > this as well.
> > 
> > If not, the problem is that it does not only happen when the screen is
> > split but also when working on an unsplit screen.
> Yes! I could reproduce the problem as well!
> I have checked in a fix (a6eea7b4d). Please try it and let me know how
> it works.  Thanks for the report.

I have been having the same problem since commit e8d36bf10.  Commit
a6eea7b4d did not fix it.  The symptoms are only noticeable when I ssh
into my box from the outside.  It doesn't appear to matter whether
I use PuTTY or rxvt (in both cases $TERM==xterm).

When I edit a long file in Vim and scroll the window, I see the cursor
jumping all over the screen.  The speed of the scroll is much
diminished.  Again, I am only able do discern this effect when
connecting to my box via ssh.  When I attempt to reproduce from
a local terminal, I am not able to notice any slow performance.  And
when I run a build of screen pre-e8d36bf10, I see no performance
impact, local or remote.

Erik Falor
Registered Linux User #445632

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