Efficiency
noun
Your effective percent shows how effective you are. If you're at an effective percent of 80%, that's your efficiency.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
一人よりも二人でやった方が効率いいでしょ？
Isn't it more efficient for the two of us to do it together rather than you doing it by yourself?
コウイチは仕事を効率よく進めるためにどうすればいいのか常々考えています。
Koichi is always thinking on how he can efficiently proceed with his work.
効率が第一だということを、しっかり心に刻んで置いてください。
Keep in mind that efficiency is our top priority.