emacs message: timed out waiting for property-notify event - emacs

Mark set
Timed out waiting for property-notify event [3 times]
When selecting a large region of code on gnu-emacs like the one shown below I got most of the time the error message above and the command prefix is not recorded (Ctrl-X) so the associated command fails.
Cursor moves becomes very slow. Cancelling the selected region revert cursor moves back to normal.
Note: This is observed through a Real VNC session, no idea if this is related with X or not.
Any idea or workaround ? Thanks.
GNU Emacs 24.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.22.30) of
2020-04-03 on x86-01.bsys.centos.org
Code region: 2048 lines of this:
parameter [RAM_DEPTH-1:0] ValueLoad = {
128'h11110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001100101011011010,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
....
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
128'h01010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
};

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