Hi Techdoc, We appreciate your feedback on the response time, and for optimal performance, we ask that you please ensure you've got the latest firmware version installed on your U7900F TV. You can check this by going to Home > Menu > Settings > Support > Software Update. You may also want to further optimize performance with the self-diagnostic tool, which checks memory, frees up unused cached memory, and closes background apps. Go to: Home > Menu > Settings > Support > Device Care > Start Device Care. If you need further assistance, we would be happy to help! Please feel free to contact Samsung Support at 1-800-SAMSUNG, (8AM – 9PM EST Mon – Fri, 8AM – 6 PM Sat – Sun), or reach us via text 24/7. You can also visit ‘Support’ on our website for: • Live Chat • Manuals, Software, & Warranty Info ~ Samsung Advisor