@nynee 

If Camera live feed lags or freeze,  here are some troubleshoot steps you could give it a try.

As router signal strength and quality plays an important role to ensure sooth live-streaming.
1. Ensure camera is receiving a good signal on the APP:
How to check the network connection stability of a Tapo Camera
2. Connect your phone to the same  Wifi network that the camera connects to and see if there is any lag in the local Wifi network? 

IF so to ping camera IP address on the phone as the above instruction and see if there is any noticeable packet loss and share the ping results 
3. Ensure Tapo app and camera are both up to date.
4. (*optional ) Try a different Wi-Fi channel on WiFi router. 

Download WiFi analyzer app and select a less crowded channel for router (this requires to reinstall  smart device, you may skip this step if you own multiple smart devices  )
5. Try a different phone and see if the issue occurs on a certain mobile device

If still the same problem, can  you help confirm some case details below 

1. may I know does the lag happen in locally  (phone connected to Home WiFi) or happens remotely (when phone connected to an outside network or using mobile data  )? 

2. Model of your phone, and its Android or IOS version? e.g. iphone 12/ IOS 15.2

3. Please hare a video clip showing the problem ( you may share via Google Drive)

4. Model of router and Tapo APP version