I did a test and it seems the performance regression is only related
to meld. It happens also when syntax highlighting is disabled.
On the same 8000 lines file meld-3.13.1 takes less than 2s to display
the first difference, it tooks 14s with meld-3.16.3, on the same
computer.
Should I open a bug ?

2016-10-17 8:59 GMT+02:00 Patrice B <pbfwdl...@gmail.com>:
> Hello,
>
>   I guess my problem is not directly related to meld but maybe you
> could give me some tricks to track what's wrong.
>
>   On a same file, on very similar cpus, the syntax highlighting
> (python) is about 10 times slower on a fedora 24, comparing to a
> fedora 20. Does someone else notice such a difference ? What could be
> done to improve it ?
>
> * gtk packages on the slow machine (F24):
>
> gtkspell3-3.0.9-1.fc24.x86_64
> gtkmm24-2.24.4-9.fc24.x86_64
> gtkspell-2.0.16-11.fc24.x86_64
> gtksourceview3-3.20.4-1.fc24.x86_64
> gtk-update-icon-cache-3.20.9-1.fc24.x86_64
> gtkmm30-3.20.1-1.fc24.x86_64
> gtk3-3.20.9-1.fc24.x86_64
> gtk-murrine-engine-0.98.2-10.fc24.x86_64
> gtk2-2.24.31-1.fc24.x86_64
> gtk-unico-engine-1.0.3-0.7.20140109bzr152.fc24.x86_64
> gtk2-engines-2.20.2-11.fc24.i686
> gtk-xfce-engine-3.2.0-3.fc24.x86_64
> gtk2-devel-2.24.31-1.fc24.x86_64
> gtk2-engines-2.20.2-11.fc24.x86_64
> gtkmathview-0.8.0-19.fc23.x86_64
> gtk2-2.24.31-1.fc24.i686
>
> * gtk packages on the fast machine (F20):
>
> gtk-xfce-engine-3.0.1-3.fc20.x86_64
> gtk2-2.24.27-1.fc20.i686
> gtk2-devel-2.24.27-1.fc20.x86_64
> gtk3-3.10.9-2.fc20.x86_64
> gtkimageview-1.6.4-8.fc20.x86_64
> gtk2-2.24.27-1.fc20.x86_64
> gtkspell-2.0.16-7.fc20.x86_64
> gtkperf-0.40-17.fc20.x86_64
> gtkmm30-3.10.1-1.fc20.x86_64
> gtkspell-devel-2.0.16-7.fc20.x86_64
> gtksourceview2-2.11.2-16.fc20.x86_64
> gtkhtml3-4.6.6-2.fc20.x86_64
> gtkmathview-0.8.0-13.fc20.x86_64
> gtksourceview3-3.10.3-1.fc20.x86_64
> gtk3-immodule-xim-3.10.9-2.fc20.x86_64
> gtkmm24-2.24.4-2.fc20.x86_64
> gtk-murrine-engine-0.98.2-5.fc20.x86_64
> gtk-unico-engine-1.0.3-0.3.20140109bzr152.fc20.x86_64
> gtk2-immodule-xim-2.24.27-1.fc20.x86_64
> gtk2-engines-2.20.2-7.fc20.x86_64
>
>
>   Regards
>
>             Patrice
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