The macbook extremaly slow when entering to recovery mode

Hi all.
I have a macbook pro mid 2010 with 10.8.5 on it
When I go to recovery mode, a computer begin to be super slow.
Also after each update what I made, I get a kernel_task 100% cpu usage, and must found and delete file macbookpro_7.1.plist
Is this any solution for this issue?
Thanks.

http://support.apple.com/kb/TS3694#hardware

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