Computer's overall processing power usually doubles every couple years making it an exponential function.
"Moore's Law asserts that the number of transistors on a microchip doubles about every two years, though the cost of computers is halved. In 1965, Gordon E. Moore, the co-founder of Intel, made the observation that became Moore's Law. Another tenet of Moore's Law is that the growth of microprocessors is exponential." According to Investopedia.
