It is important to determine the cause of the delay when attempting to change channels on a Smart TV. Here are a few steps you can take:

1. Check for any software updates available for your Smart TV.
2. If available, install any software updates to your Smart TV.
3. Check for any network-related issues such as connection speed or latency.
4. Check if the delay is consistent with all services or is specific to any particular service.
5. Check if the delay is observed with other devices connected to the network.