Unfortunately, with modern toolkits the network transparency is often abysmal. I remember that Qt 3 had awesome performance and Gtk 2.0 had passable performance

Unfortunately, with modern toolkits the network transparency is often abysmal. I remember that Qt 3 had awesome performance and Gtk 2.0 had passable performance, bit modern ones feel like they have to redraw everything from scratch by bitmapping every time and would be totally unresposible until they do that.