How does multiple users through wifi and ethernet affect Internet speeds?

[tamethegamer]

I'm sharing a house with 7 other people next year and looking for broadband packages.

Say that 4/8 of those people use the ethernet ports in their rooms to access the internet and the other 4 use the wifi to connect.
Will the wifi internet speed only be slowed by those 4 people using it or will the whole wifi speed be affected as there are still 8 people using the same router, just through different methods?

 

[USAFRet]

The whole speed to the ISP is affected by how many users total.

For instance, 50mbps from the ISP, split between 8 people (15 devices?), leaves 3-5mbps per device. If all devices are actively doing something at the same time.

WiFi performance to the router is affected by WiFi users only. But it all comes out of that same pipe to the ISP.

 

[Phillip Corcoran]

Makes no difference whether they are using WiFi or wired, the bandwidth/speed for every user will be affected by the number of people using that same network.

 

[Barty1884]

A relatively simple & 'high level' explanation for the wifi aspect:
A single band has a theoretical bandwidth (say 802.11n = 600Mbps).
The max theoretical (whatever that is, depending on the device, the bands used & router) doesn't change.
The more people you add to that wireless connection, the lower 'max' bandwidth each device can access.
In this example 600Mbps / 4 people = 150Mbps.

If the limitations become an issue, there are options to mitigate. Use the 5GHz band vs the 2.4GHz when you can (less interferance), manually select the wifi channel for each band (opposed to 'auto'), adding additional antennas can help (if your router allows) and maybe even upgrade the router to support AC + more antennas (if it doesn't already).