'performance slump' is correct and usable in written English.
You can use it to describe a decline in the performance of an individual or group over a period of time. For example, "The baseball team experienced a performance slump after their star shortstop left for another team."
That grade was the same as last year's, suggesting sustained improvements over a 1999 performance slump.
The filing laid out 37 pages of risk factors, including a possible career-ending injury or a performance slump.
In a filing for the Foster deal with securities regulators, Fantex laid out 37 pages of risk factors, including a possible career-ending injury or a performance slump.
The news that ITV1 is set to sink to a double-digit ad revenue decline in December, the prospect of which was first raised by the MediaGuardian as early as late August, is likely to see ITV's total ad sales performance slump more than 3% year-on-year in the final quarter.
Objectives: Four studies examined relationships between self-handicapping tendencies and reactions to two different yet potentially stressful sport situations (i.e., dealing with a performance slump and emotional reaction prior to competition).
The season-ending injuries and performance slumps that turn plans to jelly have not unfolded.
However, the Rabbitohs could not hold on and despite a much improved performance, slumped to their ninth straight defeat.
There is talk of a hedge-fund bubble, as billions of dollars pour into these funds even while their performance slumps.
Middle schools, in particular, have long struggled with performance slumps and competing theories on how to strike the right balance between structure and independence for students at a transitional, volatile age.
Through the use of multiple regression analysis, we determined how quickly fans supported the team when they started winning and how quickly they dissipated once performance slumped.
Under his leadership Liverpool won the 1992 FA Cup Final, but their league performances slumped, with two consecutive sixth place finishes, eventually resulting in his dismissal in January 1994.
