The phrase 'slump in performance' is correct and usable in written English.
You could use it to describe a decrease in the quality of performance or a decrease in meeting expectations. For example, "The football team had a slump in performance this season, failing to meet their expectations of making the playoffs."
Dr. Hatz promises that the Mission E will have no slump in performance.
Tesco is in turmoil after replacing its chief executive and finance director after a big slump in performance in the UK and overseas.
The group, which reported a 28% increase in profits for last year, said it had almost completed a turnaround, kicked off four years ago after an accounting scandal and a slump in performance.
Britain's Olympic sports are being encouraged to begin their planning for the 2016 Olympics in Rio de Janeiro now in an attempt to stave off the slump in performance that has consistently hit host nations in the aftermath of holding a successful Games.
For more local news from The Times, including the devastation Tropical Storm Irene created for Catskill towns and its cost to our city; the aggressive defense of Joshua Komisarjevsky, who goes on trial in September in the killing of a family in 2007; and a slump in performance for city agencies under Mayor Michael R. Bloomberg's stewardship, see the N.Y./Region section.
Neither bearish bet on bonds paid off and the Total Return fund suffered a slump in performance; its return is below the average for similar bond funds over the past five years.In the short term, PIMCO may be damaged as clients follow Mr Gross to Janus.
The effect on academic success was considerable; Brasenose slumped in performance except in law, where it excelled.
But for a mayor who advertised his managerial expertise to win a third term, some of his administration's own numbers show a clear slump in the performance of agencies Mr. Bloomberg oversees as the city's chief executive.
Matthew Pase at the Swinburne University of Technology in Melbourne, Australia, has found that high blood pressure, particularly in the central large arteries that feed the brain, can lead to a slump in cognitive performance, perhaps because it damages those vessels.
Ragdoll Ltd, which owns independent producer Ragdoll, was severely affected by a major slump in the performance of its joint venture with BBC Worldwide, Ragdoll Worldwide, which sells and licences its children's programmes outside the UK.
Burnham said that the Christmas figures "confirm the serious deterioration in the NHS under this government but reveal, more worryingly, a dangerous slump in A&E performance in recent weeks".
