Event planners hope to avoid a 'repeat performance' of last year's problems. [=hope that last year's problems will not happen again this year]
a bicyclist who was disqualified for taking 'performance'-enhancing drugs [=drugs that improve your ability to do something]
How has the company's stock 'performance' been? [=has the value of the company's stock been increasing/decreasing?]
(..) to request aerospace ...to build a prototype of their exoskeleton design. - They test in two weeks. - And if your so-called performance enhancers ...have not had a successful human trial by that date... ...I'm gonna pull your funding. I'm going to give it to them. Gentlemen. Ladies. (..)2002 Spider-Man
(..) - Norman. - Mr. Osborn. Always a pleasure to have our board of directors pay us a little visit. I want to see the progress report on Human performance enhancers. We tried vapour inhalation with rodent subjects. They showed an percent increase in strength. - Excellent. - Any side effects? (..)2002 Spider-Man