Great advice Jimi.

A lot of economy does come from playing relaxed. For various reasons this is often hard to do, yet your information is a great reminder that to play fluidly being relaxed is important. If you have stage fright or anxiety it would be a good idea to find solutions to get these under control. Yoga, stretching, meditation or whatever it takes, can have a real positive outcome on one's playing. Some anxiety can come from also not knowing the material or your own abilities. Get comfortable and confident with with both and economy will come to fruition.