Pronto often suggests a sense of urgency and that something needs to happen immediately.

Urgency Connotation

Pronto is considered informal and is mostly used in casual conversation rather than formal writing.

Colloquial Use

Using 'pronto' too often can seem pushy or rude. Use it sparingly to maintain politeness.

Avoid Overuse

 dispatcher told me that there had been hijacking of a Northwest airliner at Portland Airport and to get there pronto meanwhile Cooper makes his demands he