Usage patterns
〈事〉に早急に対応するto respond promptly to a matter
Please respond promptly to the complaint.
早急な対策を講じるto take immediate countermeasures
It was decided that immediate measures would be taken to solve the problem.
早急に〈動詞〉to do something without delay
There is a need to improve this immediately.
早急なご対応をお願いいたしますto politely request a prompt response (business set phrase)
We kindly ask for your prompt response.