Elon said that today car factories have a speed of 0.2 meters per second. Walking is five times faster than the speed of an auto assembly line.

Elon wants to be able massively speed up car factories.

Elon talked about
* Tesla having four profitable quarters.
* in the near future, all cars will become autonomous (full self-driving)
* Tesla will have a sustainable advantage against autonomous car makers with better manufacturing

If you optimized every cubic meter of the factory, then you could think of the factory-like a CPU.
You can move things closer together and increase the clock speed to increase auto production throughput.

These optimizations mean a minimum improvement of ten times and up to 100 times.