how to reduce duplicated animation size?

I have an imported Maya animation. I have split the animations, and need to duplicate one of them so that I can add Animation Events to it.

Problem is, once I add events to the duplicated animation, the .anim file size shoots up to about 140MB, which is crazy. The original .ma file is approximately 15 MB.

Any ideas as to why this would be happening?

I determined that if you add a script to handle the events, and that script references other game objects, that they cause the duplicated animation file to increase in size substantially. Wish there was a way around this.