NAND gates are generally considered to be faster than other gates like AND, OR, or NOT gates. There are a few reasons for this

1. Simplified Circuitry

NAND gates have a relatively simple circuitry compared to other gates. They have a minimal number of transistors, which means that the propagation delay (the time it takes for a signal to travel through the gate) is shorter than other gates.

2. Low Power Consumption

Because NAND gates have a smaller circuitry, they require less power to operate. This means that they can be more energy-efficient than other gates.

CMOS logic for NAND gate & AND gate

Minimum number of transistors required : NAND - 4 & AND - 6

CMOS logic for NAND gate & OR gate

Minimum number of transistors required : NAND - 4 & OR - 6

CMOS logic for NAND gate & NOR gate

NAND gates have a smaller propagation delay than NOR gates. Propagation delay is the time it takes for the output of a gate to change after the input has changed. NAND gates typically have a shorter propagation delay than NOR gates, which means that they can process signals faster.

Overall, the simplified circuitry and low power consumption of NAND gates make them faster than other gates. Additionally, their use in NAND flash memory technology has made them a vital component in modern electronics, driving further advancements in speed and efficiency.