You'll still find that the gtk file managers choke hard when you have hundreds of thousands of files in one directory (such as screenshots), taking minutes to load or even hanging and crashing. Both pcmanfm-qt and dolphin handle them fine and load within 30 seconds. I last tested this a year or two ago and every gtk file manager was roughly equally bad. Made me switch from pcmanfm to pcmanfm-qt (I didn't like dolphin as much).