What does 'e' mean in the output of 'lsattr'?

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Issue

On a EXT4 filesystem, all the files have the 'e' flag set on them by default. What does it signify?

$ lsattr my_file
-------------e-

What are the changes in ext4 which makes it perform faster than ext2/ext3?

Environment

Red Hat Enterpise Linux 6

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