HT204534 I activated filevault 4 days ago and it has rendered my macbook pro unworkable. There is no estimated time showing in firevault, it seems stuck in the same place. It will not let me turn off firevault in Sec&P or CMD+R

OS X YOSEMITE 10.10.1. 13inch late 2011 2.4 GHz DDR3  500 gig
AFter installing Yosemite and enabling Firevault my machine has become so slow it is unusable whilst encrypting is in progress. 
It will not let me turn it off.
THe estimated time remaining has never revealed itself ... it has been encrypting now for 4 days and the guider has not moved from its one quarter position.
IT will not allow me to turn it off via CMD+R
I am absolutely stuck.
HELP!
I have removed the power save options and keep the computer on all the time now with the Firevault screen visible .. nothing speeds it up.
I regret enabling Firevault .. but it is so unforgiving for the uninformed ... like me.

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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