Why is wireless Migration Assistant taking so long?

I just bought a MacBook Air and I am trying to transfer the data from my old MacBook (Late 2008) wirelessly by Migration Assistant. Both devices are the latest version but it is taking me ages and it doesn't show how long left there is. I'm tring to transfer about 100GB so I thought this could be too much (including my hole music library, some films from iTunes, documents, etc.). Please help me find out what I should do.
Thank you very much! Have a nice day!

Welcome to Apple Support Communities
100 GB is an insane amount of files to transfer through Wi-Fi. Wi-Fi is the slowest way to transfer files, and the one that cause more troubles.
Instead, I recommend to make a backup of your old MacBook onto an external drive with Time Machine > http://support.apple.com/kb/HT1427 After that, you just have to connect the external drive to your new MacBook Air and follow the same steps you have followed to transfer your files, being this a much quicker way

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