Their sales pitch when they released the M1 was that the architecture would scale linearly and so far this appears to be true.
It seems like they bump the base frequency of the CPU cores with every revision to get some easy performance gains (the M1 was 3.2 GHz and the M3 is now 4.1 GHz for the performance cores), but it looks like this comes at the cost of it not being able to maintain the performance; some M3 reviews noted that the system starts throttling much earlier than an M1.
It seems like they bump the base frequency of the CPU cores with every revision to get some easy performance gains (the M1 was 3.2 GHz and the M3 is now 4.1 GHz for the performance cores), but it looks like this comes at the cost of it not being able to maintain the performance; some M3 reviews noted that the system starts throttling much earlier than an M1.