Lag in current development branch seems to go away with PyQt6 6.8.1

[Knute Snortum]

I have been using the development version (main branch) of Frescobaldi on GitHub and one of the concerns was the lag when a big source file (> 2000 lines) was edited.  I am on Ubuntu 24.04.1 and I use a Python virtual environment (venv) to hold the non-standard version of PyQt6 (was 6.7.1).  I just updated it to 6.8.1 and the lag seems to have gone away, which is great news, except that setting up and using a venv is a little technical -- not for anyone who knows Python and some Bash scripting, but for a typical Frescobaldi user it might be a challenge.

Is anyone else using the development version (so to be the current version) and noticed lag?  I also updated qpageview and that might have done something to improve things.

[Federico Bruni]

Hi Knute

It's a problem I've never experienced because I always work on small
files.
Can you please point to a public big source file? I remember you did it
already in some GitHub discussion but I can't find it right now.

I'm building a flatpak package from git master using Qt 6.8 here (build
172903):
https://github.com/flathub/org.frescobaldi.Frescobaldi/pull/65

If it's successful anybody can easily install it and test it.


Il giorno mer 8 gen 2025 alle 16:57:19 -08:00:00, Knute Snortum
<ksno...@gmail.com> ha scritto:

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[Knute Snortum]

On Wed, Jan 8, 2025 at 9:38 PM Federico Bruni <fe...@inventati.org> wrote:

Hi Knute

It's a problem I've never experienced because I always work on small
files.
Can you please point to a public big source file? I remember you did it
already in some GitHub discussion but I can't find it right now.

https://github.com/ksnortum/chopin-opus-54

scherzo-op54-parts.ily is about 5500 lines and you can compile the whole thing with scherzo-op54.ly

 

I'm building a flatpak package from git master using Qt 6.8 here (build
172903):
https://github.com/flathub/org.frescobaldi.Frescobaldi/pull/65

If it's successful anybody can easily install it and test it.

That's great!  Ubuntu doesn't come with flatpak out of the box, but it looks like it can be installed with apt.

--

Knute Snortum

[Federico Bruni]

Il giorno mer 8 gen 2025 alle 16:57:19 -08:00:00, Knute Snortum
<ksno...@gmail.com> ha scritto:

> I am on Ubuntu 24.04.1 and I use a Python virtual environment (venv)
> to hold the non-standard version of PyQt6 (was 6.7.1). I just
> updated it to 6.8.1 and the lag seems to have gone away, which is
> great news

I'm testing two concurrent flatpak installations and to be honest I
don't see any difference.
There's always a ~5 second lag when I type a new note (5 seconds to see
the note letter appear in the text editor).

Frescobaldi flatpak old beta
Qt: 6.7.3
PyQt: 6.7.1

Frescobaldi flatpak new beta (should be available in about 2 hours)
Qt: 6.8.1
PyQt: 6.8.0

But you are using PyQt 6.8.1. It's the minor version that matters? I
may try running it from source.