'dual performance' is correct and can be used in written English.
It is used to describe two performances completed at the same time, usually in reference to an artistic performance like singing, dancing, or acting. For example, "The audience was wowed by the stars' dual performance of the classic song and dance routine."
Stock footage of George Bush and American troops in action is juxtaposed with Cooper's dual performance.
According to the Met, a dual performance of this kind is a rarity.
There is a terrific dual performance from Kirk Douglas, who plays two characters: Harrison, the tetchy farm owner, and his peg-legged brother Spur.
The two, who worked together on and off for 14 years, shared what Tormé calls a "single musical mind" in his introduction to a sparkling dual performance of "Pick Yourself Up," shown on videotape.
The success of Fury Road rested on an appetite for a high-profile franchise revival, whereas Hardy's dual performance as Ronnie and Reggie Kray is Legend's chief selling point.
Jake Gyllenhaal gives the dual performance: a depressed history lecturer in Toronto who one night watches a movie and glimpses an actor who appears to be his exact duplicate.
Yet the juxtaposition of Mr. Trump's dual performances was so jarring that his true vision and intentions on immigration were hard to discern.
Their dual performances get to the heart of a difficult and complicated marriage, and the film's portrait of the New York art world in leaner times feels authentic.
That it doesn't owes a great deal to Mr. Cooper's dual performances, which in their very different ways are equally nuanced.
The dual performances are among the most convincing screen depictions I have seen of identical twinship as a special comfort zone until the moment it isn't.
The charismatic Mr. Kelly, a performance artist who is well known for his solo tributes to Joni Mitchell, inflects his dual performances with appealing comic flourishes, and his clear, high singing has an apt otherworldly quality.
