Definition of Processing Speed (Gs)
Processing speed, a mental efficiency factor, determines the speed of scanning, reading, writing and reasoning. It is defined as:
The ability to automatically and fluently perform relatively easy or over-learned elementary cognitive tasks, especially when high mental efficiency (attention and focused concentration) is required. Dr. Kevin S. McGrew
Tests of Processing Speed
Perceptual speed. Rate of test taking. Speed of reasoning. Reading speed. Writing speed.
McGrew, K. S. (2009). Intelligence 37, 1–10.