I read that GIMP 3.0 will use GTK3 (see
https://wiki.gimp.org/wiki/Roadmap ) However, GTK3 is much slower than GTK2 (which is also why LXDE swapped to Qt instead of moving to GTK3, see
https://en.wikipedia.org/wiki/LXDE )
So, how about you just move to gtkmm (
https://en.wikipedia.org/wiki/Gtkmm ) ? This will be faster than GTK3, and also faster than Qt. Also, the code of it will be still rather similar to GTK2/GTK3, so it should be relatively easy to accomplish (at least compared to moving to Qt, or even finishing the move to GTK3).
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