after the semester break the memory consumption was even higher...I made a Tracker Entry MDL-17005.In my opinion it depends on the number of users in the Moodle installation (feedback_get_complete_users($cm->id); returns a array of all users) and not the number of answers for a feedback. I think your Moodle page has not so much users (our has 17000)?
RAM Problems after Upgrade Moodle 1.9.1 in Feedback Module
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