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[TeXmacs <address@hidden>]

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?