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Re: Newer qt5 texmacs is slow while editing


Chronological Thread 
  • From: Dennis Nezic <address@hidden>
  • To: TeXmacs <address@hidden>
  • Cc: address@hidden
  • Subject: Re: Newer qt5 texmacs is slow while editing
  • Date: Sat, 9 Nov 2019 00:44:04 -0500
  • Organization: My Other Backup Email Address
Wow, huge improvement!! Cursor movement is now very responsive here!
Thank you!

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.

(And also to make loading the program faster ... currently it takes
about 15 seconds before launching the program, and seeing my first
typed characters appear on screen.)

On Thu, 7 Nov 2019 21:33:58 +0100, TeXmacs wrote:
> Hi all,
>
> I think that I managed to fix this problem in SVN revision 12442.
>
> Best wishes, --Joris
>
>
>
> On Tue, Nov 05, 2019 at 07:19:38PM +0100, TeXmacs wrote:
> > Hi Dennis,
> >
> > Thanks for the detailed feedback; I hope to look into the problem
> > later this week; I think it is just something about the way
> > the home/end keys were programmed (they repeatedly move the cursor
> > to the left/right until the end of the line is reached).
> > I understand from your message that the problem occurs even
> > when the document contains a single long line?
> >
> > Please let us continue the technical conversation in private.
> >
> > Best wishes, --Joris
> >
> >
> > On Tue, Nov 05, 2019 at 01:11:18PM -0500, Dennis Nezic wrote:
> > > On Mon, 4 Nov 2019 14:03:09 -0500, Dennis Nezic wrote:
> > > > On Sun, 3 Nov 2019 04:11:21 +0100, TeXmacs wrote:
> > > > > Hi Dennis,
> > > > >
> > > > > On Thu, Oct 31, 2019 at 12:16:29PM -0400, Dennis Nezic wrote:
> > > > > > I was finally able to compile 1.99.11 without Qt, and it was
> > > > > > significantly faster, I think basically the same as the
> > > > > > 1.0.7 lagginess that I was used to. For example, with the
> > > > > > Qt5 compilation, simply pressing Home and End on a line of
> > > > > > basic text took about a second at 100% cpu, whereas with
> > > > > > the X11 port it took about half a second and about 50% cpu.
> > > > > > I wish both could be a lot faster, I'm not sure why this
> > > > > > would be cpu intensive, but with Qt5 it was unbearable.
> > > > >
> > > > > I would be interested trying to reproduce the slowness that
> > > > > you are experiencing. Can you please send me a simple test
> > > > > document that demonstrates the problem and tell me where to
> > > > > put the cursor and press Home and End? What kind of computer
> > > > > are you working on?
> > > > >
> > > > > The algorithm for Home and End may be somewhat suboptimal,
> > > > > but 0.5 or 1 second is too long for ordinary text.
> > > >
> > > > Using a couple of QDateTime::currentMSecsSinceEpoch() printf's
> > > > in src/Edit/Interface/edit_keyboard.cpp in handle_keypress, I
> > > > recorded the following times (in milliseconds) between the top
> > > > and bottom of the function:
> > > >
> > > > 1094
> > > > 1086
> > > > 1097
> > > > 1115
> > > > 1089
> > > > 1091
> > > > 1094
> > > > 1090
> > > > 1089
> > > > 1091
> > > > 1083
> > > > 1093
> > > > 1083
> > > > 1241
> > > > 1084
> > > >
> > > > Just by alternatively pressing Home and End on a line of text
> > > > such as: "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"
> > > >
> > > > Using a shorter string of text like "abcdef" produced the
> > > > following much shorter delays:
> > > >
> > > > 35
> > > > 27
> > > > 29
> > > > 33
> > > > 28
> > > > 38
> > > >
> > > > (I'm working on a 64bit amd-cpu 1.6Ghz laptop)
> > >
> > > The delay is in the call too "keyboard-press", which calls
> > > "key-press" in TeXmacs/progs/kernel/gui/kbd-handlers.scm. So it
> > > looks like some kind of issue with scheme/guile?

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