diff -urd -X freeciv.current/diff_ignore freeciv.current/client/packhand.c work/client/packhand.c
--- freeciv.current/client/packhand.c	Wed Sep 12 10:19:22 2001
+++ work/client/packhand.c	Sat Sep 15 10:33:38 2001
@@ -1425,7 +1425,40 @@
   enum tile_terrain_type old_terrain = ptile->terrain;
   enum known_type old_known = ptile->known;
   int tile_changed = 0;
+  static struct {
+    int counter, new, type, special, known, changed, no_change;
+  } stats;
+
+  stats.counter++;
 
+  if (old_known == TILE_UNKNOWN) {
+    stats.new++;
+  } else {
+    if (ptile->terrain == packet->type && ptile->special == packet->special
+	&& ptile->known == packet->known) {
+      stats.no_change++;
+    } else {
+      stats.changed++;
+    }
+
+    if (ptile->terrain != packet->type) {
+      stats.type++;
+    }
+    if (ptile->special != packet->special) {
+      stats.special++;
+    }
+    if (ptile->known != packet->known) {
+      stats.known++;
+    }
+  }
+
+  if (stats.counter % 100 == 0) {
+    freelog(LOG_NORMAL,
+	    "all=%d new=%d changed=%d {type=%d, special=%d, known=%d} "
+	    "no-change=%d",
+	    stats.counter, stats.new, stats.changed, stats.type,
+	    stats.special, stats.known, stats.no_change);
+  }
   if (ptile->terrain != packet->type) { /*terrain*/
     tile_changed = 1;
     ptile->terrain = packet->type;