The larger the firm, the slower the process.

The slower the clock rate; each step in a process has a bit of fixed cost to be received and executed by the next person as it is handed off.

Receive, ramp up your awareness, execute, send, ramp down, repeat.

This means that the more people that have to touch a process in sequence, the slower it will go.

Large organizations can shard specialities down to ever-more specialized niches.

That implies ever more steps in the process.

But humans can't instantly come up to speed on a new bit of information.

So organizations made of humans get slower overall as they get larger.