Perhaps you should try some spelling variations:
"improving human performance metrics." » "improving human performance measures.", "improving loan performance metrics.", "improving thermal performance metrics.", "improving chain performance metrics."
"improving power performance reviews." » "improving power performance review.", "improving power performance reports.", "improving power performance risks.", "improving poor performance reviews.", "improving worker performance reviews.", "improving core performance reviews.", "improving peer performance reviews.", "improving sewer performance reviews."

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