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Re: Newer qt5 texmacs is slow while editing


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  • From: TeXmacs <address@hidden>
  • To: address@hidden
  • Subject: Re: Newer qt5 texmacs is slow while editing
  • Date: Mon, 11 Nov 2019 20:59:51 +0100
Hi Dennis,

Yes, this sounds plausible. The original X11 was designed to be
reasonably efficient on old, much slower computers. This was done
by displaying the text around your cursor first and interrupting
the output when more keyboard input became available.
Unfortunately, Max did not find a way to do this in Qt,
so TeXmacs is now obliged to either redisplay the entire screen
or nothing at all. If you are typing fast, then it is not possible
to redisplay the entire screen after every keystroke. Instead,
TeXmacs now treats keystrokes by bursts in that case.

Best wishes, --Joris



On Sat, Nov 09, 2019 at 11:29:00PM -0500, Dennis Nezic wrote:
> Hmm, this only seems to be an issue with my qt5 compilation.
> With the x11 version (configure --disable-qt), it is okay! I can't
> type faster than the letters are being displayed.
>
> (Btw, holding a key down in this version does show the repeating
> character after a short delay, unlike the qt5 version. I guess that's
> just an interesting quirky difference between the two gui's.)
>
> On Sat, 9 Nov 2019 21:38:08 -0500, Dennis Nezic wrote:
> > When I'm typing pretty quickly, about 450 characters per minute ie.
> > 0.13s/char, I can often type 4 or 5 letter words completely before
> > they appear on screen, so the delay is about half a second, roughly.
> >
> > Might this "feature" be the "autorepeat time-out" that Joris mentioned
> > a few days ago? I'm not sure how that would be a feature :p. (Btw, if
> > I hold a letter key down, it will display the first one, and then wait
> > until I release it, indefinitely (at 45% cpu), and only display the
> > long string of the repeated letter after I release the key. But I
> > guess that's fine.)
> >
> > On Sat, 9 Nov 2019 07:51:25 +0100, Basile Audoly wrote:
> > > Hi Dennis,
> > > we have a discussion about this point a while ago on the list. This
> > > might be a feature, not a bug. How long is the delay approximately
> > > between typing a character and having it displayed on screen?
> > > Basile.
> > >
> > > > I wonder if there's a way to make normal typing more responsive
> > > > now :P. For example, I can type normal text faster on my keyboard
> > > > than it appears on screen.

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