In simple terms, "nervy performance" means a performance that is filled with nervousness or anxiety.
Sentences with «nervy performance»
the movie seems to ask, and Chau's nervy performance provides an unfortunate answer. (southflorida.com)
The child's only advocate is the nanny — Kelly Macdonald in a typically empathetic and quietly nervy performance (if Macdonald could stand up to Anton Chigurh in No Country for Old Men, she can handle this lady). (philly.com)
I actually predict a draw and a close game with a committed but nervy performance. (justarsenal.com)