Unable to delete diagram when reverse engineered - 334 tables imported

I've injected the script for our database and it has automatically created an ER Diagram which is too complex for your app to render.  I try to delete - but it starts rendering before I can delete - if I can hit the delete button after the render, it times out or crashes browser.

Can  you please help by deleting thee two diagrams in my project - and add the ability to delete a diagram without opening it.