I want to turn off Filevault. How can I stop the encryption?

Apparently the cause of my laptop turning extremely slow after the upgrade to Yosemite is mainly due to Filevault. I have tried to turn it off but I can't unless I have fully encrypted my files which seems to take forever and switch between 9 or 11 hours until it is finished for the past hour. How do I end this madness?

Back up all data before proceeding. There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
Start up in Recovery mode. When the OS X Utilities screen appears, select Disk Utility. In the Disk Utility window, select the icon of the startup volume from the list on the left. Then, from the menu bar, select
          File ▹ Turn Off Encryption
Enter the login password of a user authorized to unlock the volume, or the alternate decryption key that was generated when you activated FileVault.
You can then restart as usual, if the system is working. Decryption will be completed in the background. It may take several hours, and during that time performance will be reduced.

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