diff --git a/contrib/rating/main.php b/contrib/rating/main.php
index 31db9a56..32a90747 100644
--- a/contrib/rating/main.php
+++ b/contrib/rating/main.php
@@ -64,7 +64,7 @@ class Ratings implements Extension {
 		}
 
 		if($event instanceof RatingSetEvent) {
-			$this->set_rating($event->image->id, $event->rating);
+			$this->set_rating($event->image->id, $event->rating, $event->image->rating);
 		}
 
 		if($event instanceof ImageInfoBoxBuildingEvent) {
@@ -205,10 +205,12 @@ class Ratings implements Extension {
 		}
 	}
 
-	private function set_rating($image_id, $rating) {
+	private function set_rating($image_id, $rating, $old_rating) {
 		global $database;
-		$database->Execute("UPDATE images SET rating=? WHERE id=?", array($rating, $image_id));
-		log_info("core-image", "Rating for Image #{$image_id} set to: ".$this->theme->rating_to_name($rating));
+		if($old_rating != $rating){
+			$database->Execute("UPDATE images SET rating=? WHERE id=?", array($rating, $image_id));
+			log_info("core-image", "Rating for Image #{$image_id} set to: ".$this->theme->rating_to_name($rating));
+		}
 	}
 }
 add_event_listener(new Ratings());
diff --git a/core/imageboard.pack.php b/core/imageboard.pack.php
index 31ff6340..44b9ca4b 100644
--- a/core/imageboard.pack.php
+++ b/core/imageboard.pack.php
@@ -368,25 +368,29 @@ class Image {
 	/**
 	 * Set the image's source URL
 	 */
-	public function set_source($source) {
+	public function set_source($source, $old_source) {
 		global $database;
 		if(empty($source)) $source = null;
-		$database->execute("UPDATE images SET source=:source WHERE id=:id", array("source"=>$source, "id"=>$this->id));
-		log_info("core-image", "Source for Image #{$this->id} set to: ".$source);
+		if($old_source != $source){
+			$database->execute("UPDATE images SET source=:source WHERE id=:id", array("source"=>$source, "id"=>$this->id));
+			log_info("core-image", "Source for Image #{$this->id} set to: ".$source);
+		}
 	}
 
 
 	public function is_locked() {
 		return ($this->locked === true || $this->locked == "Y" || $this->locked == "t");
 	}
-	public function set_locked($tf) {
+	public function set_locked($tf, $old_sln) {
 		global $database;
 		$ln = $tf ? "Y" : "N";
 		$sln = $database->engine->scoreql_to_sql("SCORE_BOOL_$ln");
 		$sln = str_replace("'", "", $sln);
 		$sln = str_replace('"', "", $sln);
-		$database->execute("UPDATE images SET locked=:yn WHERE id=:id", array("yn"=>$sln, "id"=>$this->id));
-		log_info("core-image", "Locked status of Image #{$this->id} set to: ".$sln);
+		if($old_sln != $sln){
+			$database->execute("UPDATE images SET locked=:yn WHERE id=:id", array("yn"=>$sln, "id"=>$this->id));
+			log_info("core-image", "Setting Image #{$this->id} lock to: {$event->locked}".$sln);
+		}
 	}
 
 	/**
@@ -405,48 +409,49 @@ class Image {
 	/**
 	 * Set the tags for this image
 	 */
-	public function set_tags($tags) {
+	public function set_tags($tags, $old_tags) {
 		global $database;
 		$tags = Tag::resolve_list($tags);
 
 		assert(is_array($tags));
 		assert(count($tags) > 0);
-
-		// delete old
-		$this->delete_tags_from_image();
-
-		// insert each new tags
-		foreach($tags as $tag) {
-			$id = $database->get_one(
-					$database->engine->scoreql_to_sql(
-						"SELECT id FROM tags WHERE SCORE_STRNORM(tag) = SCORE_STRNORM(:tag)"
-					),
-					array("tag"=>$tag));
-			if(empty($id)) {
-				// a new tag
-				$database->execute(
-						"INSERT INTO tags(tag) VALUES (:tag)",
+		$new_tags = implode(" ", $tags);
+		if($old_tags != $new_tags){
+			// delete old
+			$this->delete_tags_from_image();
+			// insert each new tags
+			foreach($tags as $tag) {
+				$id = $database->get_one(
+						$database->engine->scoreql_to_sql(
+							"SELECT id FROM tags WHERE SCORE_STRNORM(tag) = SCORE_STRNORM(:tag)"
+						),
 						array("tag"=>$tag));
+				if(empty($id)) {
+					// a new tag
+					$database->execute(
+							"INSERT INTO tags(tag) VALUES (:tag)",
+							array("tag"=>$tag));
+					$database->execute(
+							"INSERT INTO image_tags(image_id, tag_id)
+							VALUES(:id, (SELECT id FROM tags WHERE tag = :tag))",
+							array("id"=>$this->id, "tag"=>$tag));
+				}
+				else {
+					// user of an existing tag
+					$database->execute(
+							"INSERT INTO image_tags(image_id, tag_id) VALUES(:iid, :tid)",
+							array("iid"=>$this->id, "tid"=>$id));
+				}
 				$database->execute(
-						"INSERT INTO image_tags(image_id, tag_id)
-						VALUES(:id, (SELECT id FROM tags WHERE tag = :tag))",
-						array("id"=>$this->id, "tag"=>$tag));
+						$database->engine->scoreql_to_sql(
+							"UPDATE tags SET count = count + 1 WHERE SCORE_STRNORM(tag) = SCORE_STRNORM(:tag)"
+						),
+						array("tag"=>$tag));
 			}
-			else {
-				// user of an existing tag
-				$database->execute(
-						"INSERT INTO image_tags(image_id, tag_id) VALUES(:iid, :tid)",
-						array("iid"=>$this->id, "tid"=>$id));
-			}
-			$database->execute(
-					$database->engine->scoreql_to_sql(
-						"UPDATE tags SET count = count + 1 WHERE SCORE_STRNORM(tag) = SCORE_STRNORM(:tag)"
-					),
-					array("tag"=>$tag));
-		}
 
-		log_info("core-image", "Tags for Image #{$this->id} set to: ".implode(" ", $tags));
-		$database->cache->delete("image-{$this->id}-tags");
+			log_info("core-image", "Tags for Image #{$this->id} set to: ".implode(" ", $tags));
+			$database->cache->delete("image-{$this->id}-tags");
+		}
 	}
 
 	/**
diff --git a/ext/tag_edit/main.php b/ext/tag_edit/main.php
index 9cea8ced..afdfdbe1 100644
--- a/ext/tag_edit/main.php
+++ b/ext/tag_edit/main.php
@@ -91,20 +91,19 @@ class TagEdit implements Extension {
 
 		if($event instanceof TagSetEvent) {
 			if($user->is_admin() || !$event->image->is_locked()) {
-				$event->image->set_tags($event->tags);
+				$event->image->set_tags($event->tags, $event->image->get_tag_list());
 			}
 		}
 
 		if($event instanceof SourceSetEvent) {
 			if($user->is_admin() || !$event->image->is_locked()) {
-				$event->image->set_source($event->source);
+				$event->image->set_source($event->source, $event->image->source);
 			}
 		}
 
 		if($event instanceof LockSetEvent) {
 			if($user->is_admin()) {
-				log_debug("tag_edit", "Setting Image #{$event->image->id} lock to: {$event->locked}");
-				$event->image->set_locked($event->locked);
+				$event->image->set_locked($event->locked, $event->image->locked);
 			}
 		}