--- EMWave2D.old/src/main.c
+++ EMWave2D/src/main.c
@@ -35,6 +35,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <unistd.h>
+
 #include "interface.h"
 #include "support.h"
 #define NR_END 1
@@ -485,6 +487,8 @@
 
 /* ITERATIONS */
 for(n2=0;n2<10;n2++){
+   if ((n == 1) || (n == 4) || (n == 7)) gtk_main_iteration();
+   usleep (10000);
    n++;
    rn = n;