"lightning fast" in Chinese (Simplified)
快如閃電非常快
Definition
极快，像闪电一样快；用于形容事情发生得非常迅速。
Usage Notes (Chinese (Simplified))
属口语表达，强调非常快。多用于动作和事件而非形容人。常见搭配有“快如闪电的反应”、“快如闪电的服务”。不要与“雷霆”（thunder）混淆。
Examples
The rabbit ran lightning fast across the field.
兔子在田野里跑得**快如閃電**。
She typed a lightning fast reply to the email.
她对邮件作出了**快如閃電**的回复。
The internet here is lightning fast.
这里的网络**快如閃電**。
Customer service gave me a lightning fast response!
客服给了我一个**快如閃電**的回复！
He finished his homework lightning fast so he could go outside.
他**快如閃電**地完成了作业，好出去玩。
That car is lightning fast on the highway—no wonder everyone stares.
那辆车在高速公路上**快如閃電**——难怪大家都看。