That's a pretty vague write up from the auditor. Can you cite the SQF code number he listed that finding under?
I'm guessing it's off of the quality code as it doesn't sounds like something in the food safety standard. Do you recall what records the auditor was asking for when they decided this would be a finding? Do you recall a part of your audit where you couldn't provide a record they asked for? If you're in the position of responding to this audit finding, you should know what process controls are being used by your facility (or have direct access to the people who monitor them). Each plant has different processes, ergo ways to monitor them to ensure you remain in control of your product and programs.
Taking the auditor at face value, it sounds like they're claiming you were unable to provide documentation for any checks that monitor "process efficiency, product quality and reduce waste." If these metrics are something in your SOP's, then find what your SOP states you're supposed to do. If not, ask yourself:
"What are we doing to improve process efficiency?"
"What are we doing to improve product quality?"
"What are we doing to reduce waste?"
Answering those questions and writing them into your SOPs, with someone assigned to verify periodically, is my best guess at trying to solve given the information I've read here.