When I import Gtk library my code became immaediately slower

Hi, I have created a GUI whit Gtk, but it was so slowly. To make a test I have import the Gtk library (using Gtk) in a code, without using it, and the code immediately went slower. Anyone have an idea on why?

Likely this: https://github.com/JuliaGraphics/Gtk.jl/issues/325#issuecomment-398495499