BACKUP in itunes too slow iPhone 3G

Hello!When i connect the iPhone 3G to my iTunes 7.7, ALWAYS iTunes start a backup and sometimes this backup is TOO SLOW (over 25 minutes!!).Who can help me ?With my iPhone EDGE this problem was not!!Is normal that every time that I connect iPhone start backup ? iMac intel 20" 1 gb ram - 256 mb vram graphic card Mac OS X (10.5.4) itunes 7.7, iPhone 3GiPhone Chat

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