Itunes wifi sync 20MB/s

Hello Ifoney,

Thank you for reaching out to Apple Support Communities.

While syncing with iTunes it will depend on how much data is being transferred. You can enable and disable certain things from syncing which will affect transfer time. This may help:

"Sync or remove content using iTunes

1. Open iTunes and connect your device to your computer with a USB cable.
2. Click the device icon in the upper-left corner of the iTunes window. Learn what to do if you don't see the icon. 
3. From the list under Settings on the left side of the iTunes window, click the type of content that you want to sync or remove.* To turn syncing on for a content type, select the checkbox next to Sync.
4. Select the checkbox next to each item that you want to sync.
5. Click the Apply button in the lower-right corner of the window. If syncing doesn't start automatically, click the Sync button."

More details can be found here: Use iTunes to sync your iPhone, iPad, or iPod with your computer

You can also leave feedback for Apple directly by going to Product Feedback

Cheers!