Road lanes are like CPU cores. And like CPUs, adding more cores does not linearly scale up traffic capacity.

In the case of CPUs, there's sync and communication overhead; for highways, there's more turbulence and slowdown generated by lane-switching.

That's why we are focusing on adding GPU cores instead, but they can only do the same operation on a lot of data in parallel (much like mass transit).

Adding more lanes encourages more driving. That's why it never reduces traffic

Same with computers. More power and bandwidth and storage space has largely meant our apps and websites have grown to fill it.