Similar psychology:
Keeping response times under the Doherty Threshold could help reduce churn, as users tend to tolerate a little latency but may drop off rapidly once waits drag on.
Faster interfaces might help hold users' attention and interest, since waits beyond the Doherty Threshold of roughly 400ms can leave people feeling disinterested.
Cutting delays at tense moments, e.g., just after payment, may lower user frustration, as waits past the Doherty Threshold can make people worry something went wrong.
Filling unavoidable waits with riddles or progress explanations could increase users' enjoyment, softening the dip in mood when a wait crosses the Doherty Threshold.