It is in the execution of coloratura passages that Mijanovic excels, as she combines the speed of her less weighty voice (a la Mingardo) with her dark timbre. The pace of the aria "Empio, dirò, tu sei", in the video below, is just right: the coloratura is neither rushed (i.e. flawed) nor is it laboriously slow.
There are a couple of octave drops into the lower chest register: the first at the end of 'B' section, where she drops down to G3; the second is at the end of Da Capo, where Mijanovic performs a fast octave run down to a F3, which is so powerful it's rather frightening!
The aria itself is in C minor. Most rage arias from Handel are in a minor key, and most are either fast or full of coloratura. "Empio, dirò, tu sei" combins all of these features, and is for me an overlooked gem.
Here is a PDF of the whole opera. The aria below starts on page 20 of the score. Enjoy the dark sound of this most intriguing contralto.