Hi Nath, We appreciate your feedback on the Samsung CU7000 TV. I'm sorry to hear you are experiencing issues with your Wi-Fi being slow and the YouTube app not performing well. Please try the below troubleshooting steps to help resolve these issues. First, let's ensure you are running the latest Firmware. Go to Settings> Support> Software Update. To ensure you do not miss any Firmware Updates, I recommend enabling Auto Updates. Go to Settings> Support> Software Update> then select Auto Update. Next, let's try running a cold boot on your TV. To do so, hold down the Power button on the Samsung TV remote until the TV turns off and then on again. This should take about 5 seconds. I hope these tips help resolve your concerns. If you need more help, Samsung is here for you. Please call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website. ~ Samsung Advisor