Is what you're saying that the lag is actually the period before the turbo spins up and starts producing boost? In somewhat different wording, the lag is the en

Is what you're saying that the lag is actually the period before the turbo spins up and starts producing boost? In somewhat different wording, the lag is the engine running as if it were NA until the turbo can spin up to a speed that it will compress the incoming air? That's what I have always thought turbo lag is.