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Re: [TeXmacs] TeXmacs' responsiveness


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  • From: TeXmacs <address@hidden>
  • To: address@hidden
  • Subject: Re: [TeXmacs] TeXmacs' responsiveness
  • Date: Sun, 7 Jul 2019 16:05:42 +0200
Hi all,

I recently finetuned the responsiveness; I don't remember whether
this occurred between versions 1.99.9 and 1.99.10, but this is possible.

In fact, there is a trade-off between 'latency' and 'throughput'.

If you are typing a sufficiently simple document, the typesetting+rendering
is fast after each key event. In that case, it is best to render incoming
text
on the fly, i.e. to priviledge a reduced latency.

If you are typing a somewhat more complex document, then the typesetting+
rendering may take more than 0.1 second. In such a 'regime', it is better to
group several keyboard events together and redisplay incoming text in chunks,
and a little bit less frequently. Otherwise, TeXmacs keeps displaying
new characters several seconds after you typed them.

The new implementation forces TeXmacs to render incoming text when you
type the space bar. When typing fast, you should thus see text appearing
word by word. For an empty document, the latency is perceptable,
especially on slower computers, but not huge, in my opinion.
It would be nice if we could reduce it further, but that does
not seem particularly easy.

Best wishes, --Joris



On Thu, Jul 04, 2019 at 09:29:46PM +0100, Hemza KHERIBOT wrote:
> I just update to latest version 1.99.10 i find it more responssive (both
> text mode and math mode).
> Thanks
>
> On Thu, 4 Jul 2019 at 20:10, Frank <address@hidden> wrote:
>
> > Hello,
> >
> > Could you please have a try for the latest build (several days ago, a
> > new version was released) since some delay behavior was changed as Darcy
> > Shen mentioned?
> >
> > https://www.texmacs.org/tmweb/download/download.en.html
> >
> > It helps pinpoint main obstructions of the performance.
> >
> > Best wishes,
> >
> > Le 04/07/2019 à 20:57, Hemza KHERIBOT a écrit :
> > > Hi,
> > > Even i'm not a 120wpm typist I can feel the latency of texmacs ... I
> > > used texmacs on may systems since 2019 (from ubuntu to artix, and MS
> > > of course!). I was blaming my system configuration but that was not
> > > the case. hope it can be reduced in next builds!
> > >
> > > best regards!
> > >
> > > On Thu, 4 Jul 2019 at 16:27, Alexandre Danescu
> > > <address@hidden <mailto:address@hidden>>
> > > wrote:
> > >
> > > Hi all,
> > >
> > > No latency (for me...) on Windows with TeXmacs version 1.99.5...
> > > but I'm not at 120 wpm !
> > >
> > > Alexandre
> > >
> > > Le 7/4/2019 à 3:15 PM, Massimiliano Gubinelli a écrit :
> > >> Hi all,
> > >> I found this comment in hackernews:
> > >>
> > >> "
> > >> The keyboard latency makes this program completely unusable! I've
> > been following the project for the last two decades hoping someday it
> > would
> > be useful to touch typists who type around 120 wpm. Until then ... I just
> > keep using emacs + auctex. Sure looks nice though.
> > >> “
> > >>
> > >> “
> > >> NB: I tried both slowphil's custom build on github and the native
> > windows binary downloadable from the main web site. Typing lag (estimated
> > at 500-800ms) is totally unacceptable in both instances.
> > >> “
> > >>
> > >> do you people feel that this comment is correct? and that we have
> > a latency problem?
> > >>
> > >> With the last TeXmacs I also experience some slugginess while
> > writing slides.
> > >>
> > >> Do we have a problem here? Or is just an impression?
> > >>
> > >>
> > >> Best
> > >> Max
> > >>
> > >
> > --
> > Best wishes!
> > Yours,
> >
> >

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