I think we should come up with a corresponding law of software development 'as computers become more powerful, more of those extra cycles will be wasted'.

Perfect :-) thanks!

Now that I think about it, perhaps it is like traffic. When they add more roads, the amount of traffic stays the same. There is a certain tolerance/threshold we can endure for traffic.

In this same way, we can tolerate a certain amount of lagginess in our computers. The hardware will get faster and faster, but the relative interface performance will remain the same.