I've been using Dia for my diagrams in linux for 20 years or so. It's always been fast and responsive. However since I updated to Ubuntu 24.04, the editing windows of Dia are not responsive at all.
After digging a bit, I found that Dia uses GTK2. Could this be an issue of Ubuntu having worse support for them? Could it be a windows manager issue (i.e. X vs Wayland) ?
Same problem here. After some digging I've found there's an issue on Dia with loading fonts which is basically why it has become slow and unusable. Apparently if you have a lot of fonts installed you will have this problem. A possible workaround would be to disable most of the fonts you don't need.
This answer explains how to do this with the font manager. Basically, first install it:
sudo apt-get install font-manager
Then select fonts you do not need and untick their box to disable.
Personally, I find this totally unacceptable as there are other apps on the system I want to use that could use those fonts. I really hope this can be resolved. Meanwhile, perhaps we have to find an older version (0.97) to use.
