Chaning Autotile Animation Speed

So I am trying to get my animated water tile to animate correctly, and the animation seems very choppy in RMXP despite it not being so choppy else where. I was wondering if there was a way to change the speed at which an autotile animation runs in Essentials. I know that in the default scripts for RMXP you in theory can just change the section of code in Spriteset_Map regarding @tilemap.update, to X.times {@tilemap.update} where X would essentially be the speed of animation, however this doesn't seem to work in Essentials. Any help would be greatly appreciated!

Thanks

In the script section TilemapXP, find the line Animated_Autotiles_Frames = 15. This number is the length of time each frame of an autotile is displayed for (there are 40 frames in a second).