Diagnosis
The TV's internal storage or memory is bogged down, a common issue as the SmartCast OS caches app data over time.
How to Fix It
Clear the app caches and perform a soft power cycle.
1. Go to Menu > Admin & Privacy > Reset & Admin.
2. Select 'Soft Power Cycle' and confirm. The TV will reboot.
3. After reboot, go to Menu > Admin & Privacy > Viewing Data, then select 'Clear TV Viewing Data'. This clears caches without deleting your logins.
If That Didn't Work
The Wi-Fi connection might be the bottleneck. Test speed by running the Network Connection Test in Menu > Network. If it's slow, consider using an Ethernet adapter (uses the TV's USB port) for a wired connection.
Heads Up
Avoid using the TV's built-in web browser for streaming; it's a major resource hog and will slow everything down.