問題が発生した場合、迅速に対応いたします。
If a problem occurs, we will respond promptly.
彼の迅速な判断が事故を防いだ。
His swift decision prevented an accident.
The company earned customers' trust through its prompt response.
If a problem occurs, please report it promptly.
The government promised to take prompt measures.
This system enables quick processing of orders.
迅速 is a formal, often written word for 'swift/rapid', whereas 手っ取り早い is casual and stresses practical speed over formality.
迅速 is a formal Sino-Japanese term for rapid action used in official or written contexts, whereas スピーディー is a casual loanword with the same idea.