Clonezilla using dd on Fedora 16 LVM

I'm trying to do a disk to disk clone of a 500GB Fedora 16 installation using Clonezilla, but it keeps using dd to copy the root ext4 LVM, and is doing so very slowly (~375MB/minute, 24hrs total copy time). I have maybe 100GB of data on this drive.

I've used Clonezilla to copy CentOS 6 box with a similar setup (1 root LVM with ext4), and it correctly copied just the files and didn't use dd to copy all sectors. Does Fedora 16 have something other than LVM2, or is the GPT messing up Clonezilla's recognition of ext4 on LVM?

OR, what should I use to more quickly clone a Fedora 16 installation?

EDIT: The LVM is definitely not encrypted.