Loading time for gtk.gdk.pixbuf_new_from_file_at_size() is greatly increased when given specific small x/y resolutions as paramaters.

Example:

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 20, 20)
Time to complete: 0.17 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 19, 19)
Time to complete: 0.16 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 18, 18)
Time to complete: 1.06 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 17, 17)
Time to complete: 0.43 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 16, 16)
Time to complete: 0.17 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 15, 15)
Time to complete: 0.18 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 14, 14)
Time to complete: 2.93 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 13, 13)
Time to complete: 7.25 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 12, 12)
Time to complete: 0.23 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 11, 11)
Time to complete: 1.80 s

gtk.gdk.pixbuf_new_from_file_at_size("example.png", 10, 10)
Time to complete: 0.45 s

I don't know the details of the algorithms used by gtk.gdk.pixbuf_new_from_file_at_size(), but I guess that this behaviour should not be expected.

The image file used was a 1280x1024 px PNG image of about 2.0 MiB.