He was a poor performer at school and left with no qualifications.

他在校学习成绩不好，没有毕业就离开学校。

《牛津词典》

Louisiana is another poor performer.

路易斯安那州也是表现不佳的一个州。

youdao

If you find that the employee is doing a poor job, there will be time to go back and get the complaining employee's input, but you should be on a track to remove the poor performer at that point.

如果你发现他们的工作表现很差劲，那么你应该回去仔细考虑抱怨者的信息，但是你应该考虑将表现差的员工开除。

youdao

Selling a poor performer, whether a stock or mutual fund, can often be surprisingly difficult.

FORBES: Should You Sell That Mutual Fund? Steps To Consider

As you can see, Russia hardly stands out for being a uniquely poor performer.

FORBES: Russia's Population Decline in Regional Perspective

Another poor performer was Tokyo's Nikkei index, which closed with a 27.2% loss on the year - and a massive 34% drop from the highs reached in March.

BBC: Stock markets see red over 2000