[sebcat]

> Not using MOSFETs would make it faster, in theory.

My understanding is that the MOS 6502 was MOS, so MOSFET. Not using MOSFETs would make it less of a replica.

Implementing the replica in an integrated circuit instead of discrete transistors would lower capacitance.

The delay time is a consequence of the capacitance.

[junon]

I'm aware of all of this (I even mentioned the MOSFET vs not in my comment), I was just answering the OPs questions.