The quality, efficiency, and speed of running gameplay as a result of several factors in the design and structure of the game and its architecture.
High performance is a big goal of any quality game. Performing low by having extensive load times, poor framerate, or other issues in the resolution of actions will result in a poor gaming experience. See also: Computer Performance on Wikipedia.
Like any software, the performance of a game is affected by a myriad of elements, such as throughput, loading speed, and bandwidth. With that comes a myriad of things that can hamper the performance. Questions with this tag deal with all of the different elements that influence the performance of a game, and how one should optimize things such as data storage, calculations, and scalability in order to provide a quality gaming experience.