Definitions by Geoff
fps
Frames Per Second. The general benchmark for computer performance in a video game. Refers to the number of times the image on a computer monitor gets refreshed per second. 60 fps is generally the benchmark for acceptable performance; that provides a buffer for when the action in a game gets heavier.
RTS
Real-Time Strategy. Refers to a strategy-based computer game, generally involving management of an army or civilization.