Multiple OCRs and the overhead related to it

Hi all,
   Oracle 11.2.0.3
   OEL 6.3
   Readind the fine manual, i saw a phrase saying that multiple OCRs (mirrowed OCRs) can cause an overhead. On my test env, i mirrowed my OCR to another diskgroup, even using normal redundancy in the original diskgroup. I did it only for learning/testing purpose. The main question is: This overhead is significant? I mean, if i add 5 redundant OCR copies, it will negativelly impact my env?
Thanks in advance.

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