to moderators: I'm not sure if this problem is related to router settings, or is a problem with our broadband. I've posted this in NZ Broadband, but it may belong in Networking>LAN.

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Hello, we're currently scratching our heads trying to figure out why we're getting such poor internet performance for some of our devices, while it runs just fine on others. None of us are experts, so hoping we can get some insights here.

The problem:

Internet runs fine on the two Windows computers we're using. Terrible on iMac, iPad, iPhones, and also an Android smartphone.

• Websites often timeout. 
• Certain apps (esp. games) just can't get through the loading screens (failing to connect, I assume?), or take a very long time (but work alright once 'connected', if it doesn't timeout). If using mobile data, the same loading screens take less than a second.
• Can't use Netflix on iPad.

One of the computers running Windows is actually a macbook, and switching over to macOS sees an immediate change in internet performance (for the worse).

All the devices connected by WiFi, so I suspect this is where the problem lies. Sometimes they do manage to work ok, though still slower and less reliable than using mobile data.

Details:

We're with TrustPower, using VDSL. (residential naked unlimited VDSL). We've had this same problem since signing up (3 months or so now).

Using the router they supplied: NetComm Wireless NF10W. All devices connected by WiFi.

A master splitter has been installed by previous tenants of this apartment, I'm pretty certain. (has the socket labelled as 'VDSL', landlords not sure about this sort of thing).

We didn't have these problems at our last flat.

Here is a screenshot from the WiFi settings page: here.

What we've done so far:

• Resetting the router provides relief to these problems, but they pop up again within the same day.
• We've tried WiFi channels 1, 6 & 13. (it is a pretty crowded area?) Router says the interference is 'acceptable'.
  Image from 'WiFi Analyzer'
• We've disabled QoS. I thought this fixed it, but the relief we had was probably just due to resetting.
• TrustPower support has had us switching WiFi channels, but any success we've had there is also probably just from resetting.

We do have a large number of devices. At max, we have 3 smartphones, 3 computers & an iPad all using the WiFi. Still have problems when only four things connected, but maybe it's less pronounced--would need to test that more thoroughly somehow. 

If there is any other info I can provide to help solve this one, let me know! Since one of us has recently transitioned to working from home, and using the iMac, we really need to solve this. 

Thanks, 

Pita