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I haven't personally noticed any differences, but is there a toll on normal usage of iTunes and syncing it with your iPhone if you fit a developer profile by having Xcode on your system including relevant mobile components (Mobile Device Framework) that ask to be installed? I'm curious because during installation, iTunes is asked to be closed. I'm not part of the Developer Program yet and as such my phone is not yet marked as a development device.

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2 Answers

The short answer is no, it shouldn't.

It asks to quit iTunes because Xcode needs to install its own 'hook' to interact with iTunes. Quitting iTunes just reduces any risk as it gets installed. For example, one of the iTunes plist may be getting updated during install.

As with Jeff's answer, backups may take slightly longer because there may be more data on there, but I haven't even noticed this myself.

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I have been a developer for little over a year and had have not noticed any slowing down since and because of Xcode - the only thing is that sometimes making backups takes a long time, if you do not backup your iOS device everyday - but I don't see that being related to Xcode.

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