In your environment, there could be other wireless networks around.
The other wireless networks might reduce the speed of your home wireless network and cause the video judder.
You may try of the following:
- Use a wireless network based on IEEE 802.11n
- Reduce the bitrate of the projection to try to reduce network usage
- Connect your TV to the access point of your home network using wired connection, and your PC to the same access point using wireless
- Connect your PC to the access point of your home network using wired connection and your TV to the same access point using wireless
- Connect both the PC and the TV to the access point of your home network using wired connection