Index: wp-admin/js/post.dev.js
===================================================================
--- wp-admin/js/post.dev.js	(revision 17517)
+++ wp-admin/js/post.dev.js	(working copy)
@@ -170,7 +170,7 @@
 	get : function(total, num) {
 		var st = this.st, data;
 		if ( ! num )
-			num = 20;
+			num = 10;
 
 		this.st += num;
 		this.total = total;