I have just updated from 4.2 to Xcode 4.3 and "Instruments" is no longer there.
I tried to run it from Launchpad but was informed that this is not possible because Instruments is in the trash bin.
Xcode 4.3 uninstalled 4.2 but it seems it did not bother installing a new version of Instruments.
Open Xcode. Choose Xcode > Open Developer Tool > Instruments.
How can I access Xcode Instruments? You can access the instruments by using Product ➔ Profile from the Xcode menu for which the shortcut handle is ⌘ + I . This will rebuild your product and opens the Xcode Instruments overview.
Instruments is a powerful performance analysis and testing tool that's part of Xcode toolset. Instruments can help you profile your apps on all platforms - iOS, macOS, watchOS, tvOS - in order to better understand and optimize their behavior and performance.
You can launch Instruments from within Xcode. It is no longer in the /Developer folder but in /Applications/Xcode.app/Contents/Developer.
From the menu bar, choose Xcode > Open Developer Tool > Instruments.
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