Netflix says you need 25 Mbps for "Ultra HD Quality"[1], so yes, you could watch a different 4K stream in every house simultaneously. And have 25 Mbps left over for other traffic.
Edit to add: Netflix is right.
If you can't get reliable 4K with a 25 Mbps connection, the most likely reasons are:
- First by a wide margin, is that you are using Wi-Fi to connect your display device. Don't do that. Use ethernet (at least until you have 802.11ax everywhere).
- Second, you have a flaky connection to your ISP. Misconfigured, marginal (e.g. DSL more than 2.5 kilometres from the cabinet) or in poor electrical condition.
- Third, you have neighbours regularly operating very large electric motors or electric arc welders.
- Fourth, your ISP doesn't know what it's doing, or is deliberately monkeying with your service to try to upsell you.
Netflix says you need 25 Mbps for "Ultra HD Quality"[1], so yes, you could watch a different 4K stream in every house simultaneously. And have 25 Mbps left over for other traffic.
Edit to add: Netflix is right.
If you can't get reliable 4K with a 25 Mbps connection, the most likely reasons are:
- First by a wide margin, is that you are using Wi-Fi to connect your display device. Don't do that. Use ethernet (at least until you have 802.11ax everywhere).
- Second, you have a flaky connection to your ISP. Misconfigured, marginal (e.g. DSL more than 2.5 kilometres from the cabinet) or in poor electrical condition.
- Third, you have neighbours regularly operating very large electric motors or electric arc welders.
- Fourth, your ISP doesn't know what it's doing, or is deliberately monkeying with your service to try to upsell you.
1. https://help.netflix.com/en/node/306