Speed of any logic gate is dependent on the longest string of series connected transistors. In NOR gates that string is made of pFETs and in NAND gates it is nFETs. Since nFETs are faster (higher mobility for electrons than holes) NAND gates are faster.
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Speed of any logic gate is dependent on the longest string of series connected transistors. In NOR gates that string is made of pFETs and in NAND gates it is nFETs. Since nFETs are faster (higher mobility for electrons than holes) NAND gates are faster.