Please check your lookup threshold value in Central Administration->Manage Web Application, select your web application and go to General Settings-> Resource Throttling (in the ribbon). Please remember that a people group and workflow status fields count as lookup fields.
You can increase the list view lookup field threshold number and monitor your SharePoint environment for any anomalies (CPU utilization, slow response, etc).
Also please note that even you don't include the lookup fields in the Display Fields of the qListView they're still included in the qListView.
If you have any questions please let me know.