Direct opposite — a decrease in speed or rate of activity
文法句型
a speedup in [noun]
speedup of [amount]
用法筆記
Speedup is most often used in technical or business contexts — computing, manufacturing, logistics. In everyday conversation, people usually say "things are getting faster" or "the process sped up" instead.
常見錯誤
The new computer gave me speed.
The new computer gave me a speedup.
'Speedup' is a countable noun and usually needs an article ('a speedup') when referring to a specific instance of faster performance.