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# defaultPerformanceMetrics

An array of default performance metrics the test records.

```
class var defaultPerformanceMetrics: [XCTPerformanceMetric] { get }
```

## Discussion

When you call [`measure(_:)`](/documentation/XCTest/XCTestCase/measure(_:)), the test uses this property to determine which performance metrics to record. The default is an array that contains [`wallClockTime`](/documentation/XCTest/XCTPerformanceMetric/wallClockTime). Subclasses of [`XCTestCase`](/documentation/XCTest/XCTestCase) can override this method to change the behavior of [`measure(_:)`](/documentation/XCTest/XCTestCase/measure(_:)).

## See Also

[`wallClockTime`](/documentation/XCTest/XCTPerformanceMetric/wallClockTime)

A performance metric that records the time in seconds to execute a block of code.


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