If you're talking about carrying out an action:
* Refrain
* Abstain
* Cease
* Stop
* Hold back
* Suspend
If you're talking about a theatrical performance:
* Audience (the opposite of the performer)
* View (as in "to watch a performance")
If you're talking about a function or operation:
* Fail
* Malfunction
* Breakdown
If you're talking about performance in a general sense (e.g., performance at work):
* Underperform
* Fail
* Lag behind
* Stumble
It's important to consider the specific situation to determine the most appropriate opposite for "perform."