def METHOD_NAME():
    """Simulate a overhead while reading on storage."""
    def delayed_list(*args, **kwargs):
        time.sleep(0.100)  # 100 msec
        return []
    with mock.patch.object(self.model.storage, "list_all", delayed_list):
        self.resource.plural_get()
        fetch_at = self.last_response.headers["ETag"][1:-1]
        timestamps["fetch"] = int(fetch_at)