power user

plural power users

1. computingA person who makes heavy use of computers, running many applications and capable of using advanced functionality.

   Whether you already consider yourself a 1-2-3 power user or would like to become one, the fact that you have picked up this book probably qualifies you as a person who will benefit from a guide to the real power of 1-2-3.

   1988, E. Michael Lunsford, Peter Antoniak, Power user's guide to 1-2-3, Sybex Inc, →ISBN

   Synonyms: enthusiast

2. computingA computer user who seeks and uses products having the most features and the fastest performance.