Summaries are not scripts. You don’t write an overview of your results to be able to read them out. You don’t make a list of helpful references to simply parrot them back on the day.
The value of a summary is that it helps to highlight what matters. It’s a practical task that gives you an opportunity to draw your thinking together. It helps you to find the words you need to express yourself.
If you invest a little time in writing one or two summaries before your viva then you prime yourself to respond well in the viva.