RawTherapee 5.3 Released

Hi @PanoMeister

Just a wild guess, perhaps it will give us nothing new, but… you could try performing this test. The next time RT becomes slow, can you please run the following simple program?
https://filebin.net/yszpw83sr43s76ra/test.exe
you need to put it in the top directory of RT (i.e. where rawtherapee.exe is located).
The program just creates a bunch of file chooser buttons – I just want to check whether they have anything to do with the problem you are experiencing (since IIRC there was something about them in one of your log files)
Note: the SHA1 sum of the above exe should be 209e8383e7e36d31cad44a1053fb19981399d4b4

EDIT. Here’s the source code just in case:

#include <gtkmm.h>

int main(int argc, char **argv)
{
    auto app = Gtk::Application::create(argc, argv, "org.gtkmm.examples.base");

    Gtk::Window window;
    Gtk::VBox box;
    
    for (int i = 0; i < 10; ++i) {
        Gtk::FileChooserButton *b = Gtk::manage(new Gtk::FileChooserButton("test button", Gtk::FILE_CHOOSER_ACTION_OPEN));
        box.pack_start(*b);
    }

    window.add(box);
    window.show_all_children();
    
    return app->run(window);    
}
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