Attention is limited. Action consumes capacity. Simultaneous optimization is impossible.
The priority rule: When internal computation (planning, evaluating, scripting) and external observation (listening, seeing, receiving) compete for the same finite capacity, external observation must win. This is not a preference — it is the constraint that makes Be Present and Be Simple structural necessities rather than philosophical ideals.
Under overload, the system doesn't crash — it degrades. Channels start dropping. You catch words but miss tone. You hear the offer but lose the physical context. You default to habit instead of responding to what's actually happening. In extreme cases (task saturation), the freeze response activates — the "deer in headlights" that marks a performer whose internal processing has consumed all available capacity for reception.
The consequence: every cognitive task an improviser adds — planning the next line, monitoring their own performance, evaluating whether the last move was good — directly subtracts from their ability to receive what is happening now. This is why beginners struggle: they are running too many processes on too little hardware. Expertise doesn't add bandwidth. It reduces the processing cost of basic operations, freeing capacity for reception and response.
For the full treatment of bandwidth as a concept — individual vs. shared, emotional bandwidth, recovery mechanisms, the cognitive science backing — see the Bandwidth definition atom.