Like the wind
Definition 1 of 2
Pro Tip 1/3Speed Implication
The phrase emphasizes rapid action, often hastier than 'quickly' alone suggests. 
He finished his exam like the wind and left the room.
Pro Tip 2/3Informal Context
Used in casual conversation, not for formal writing or speeches. 
She completed the project like the wind, surprising everyone.
Pro Tip 3/3Urgency Connotation
Often implies a sense of urgency or need to act immediately. 
When the gates opened, everyone rushed in like the wind.