Anti-lag script

This just makes sure that character sprites are actually onscreen before
updating them, for game events.  This greatly improves performance on
larger maps that have many game events.

scripts/Spriteset_Map.rb

@@ -242,7 +242,15 @@ class Spriteset_Map
     @fog.tone = $game_map.fog_tone
     # Update character sprites
     @character_sprites.each do |sprite|
-      sprite.update
+	  if !sprite.character.is_a?(Game_Event)
+	    sprite.update
+	  # this is just a check to make sure the sprite is onscreen for game events
+	  # based on its current width and height
+	  # no point in updating the sprite if offscreen
+	  # this greatly increases performance on larger maps
+		(sprite.character.real_y - (sprite.oy*4) < ($game_map.display_y) + (17 * 128)))
+          sprite.update
+	  end
     end
     # Update footprints
     @footprint_sprites.delete_if do |sprite|