I turned on Xcode4's snapshot on replace feature. I want to turn it off. How do I do that?
File->Project Settings (or File->Workspace Settings if you're in a Workspace), and then click on the 'Snapshots' tab: you want to uncheck the "Create snapshot of project before mass-editing operations" box.
Thanks to Teknogrebo for pointing out in the comments how to do this for workspaces rather than projects.