The performance of your network can have a big impact on your ability to stream videos. Streaming videos successfully requires a strong, consistent signal. It is recommended that you have at least 3 Mbps dedicated to each computer/device that is connected to your network.
How fast is my network
There is not an easy way to measure how consistent your network signal is. However, you can run a test for the speed of your network by following this link:
Just choose the location that is closest to you and this will tell you your upload and download speed.
How can I improve my network
Below is an article that has some useful ideas for getting better performance out of your network.
In addition, any time it's possible to use a "hardwired" connection instead of wireless, you will most likely find that gives you a more reliable streaming experience.
Who else is connected to my network?
If you have many computers or devices connected to your network, you will need a much faster network connection. Often, churches will find that streaming videos on the weekends will seem slower than streaming throughout the week. This is likely due to the number of members at your church who have devices connected to your network. One possible solution for this is to have a separate network which is "private" and only accessible for church staff.
There are many things that can interfere with your wireless network's signal. Apple has a great article discussing network interference which you can find here:
Quality of Service (QoS)
If you are tech savvy or have someone that handles IT for the network, you could look into the possibility of using QoS to prioritize your network traffic. You can learn more about this here: Quality of Service (QoS)