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Opening and closing dialogs/windows, switching tabs in editor, and turning toolbars on and off takes significantly longer in GTK L&F. See the attached html table with the numbers. (This issue may be partially related to the bugtraq issue #5042603: GTK L&F - delayed repaint of window)
Created attachment 14755 [details] Table with the measured times
Created attachment 16074 [details] New measurement
Performance problem is in JDK; GTK L&F will not be supported for promo D.
Once we'll support GTK, we'll file this issue again if still valid ... verified/closed