Mine is ad-libbing or improving.
I HATE having to do this, because I need time to think about what to say. I need time to analyze, think what will work and what won't, etc.
I don't want to say something that the author of the play would hate to be included in the script.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle