How Many Devices Can Your NZ Broadband Handle?

The average New Zealand household now has 15–25 connected devices. That sounds like a lot until you start counting: phones, tablets, laptops, smart TV, streaming stick, gaming console, smart speaker, security cameras, smart doorbell, robot vacuum, smart lights, smart plugs, a weather station, maybe a smart washing machine or fridge.

Most of these devices are invisible to you — they connect to Wi-Fi and quietly do their thing. But they all consume bandwidth, maintain connections to cloud servers, and compete for your router's attention.

The surprise isn't that your internet sometimes feels slow. It's that it works as well as it does with this many devices fighting for resources.

Not all devices are created equal when it comes to bandwidth consumption:

4K streaming (Netflix, Disney+, YouTube): 15–25 Mbps per stream. This is the biggest bandwidth hog in most homes. Two simultaneous 4K streams eat 50 Mbps.

HD streaming: 5–8 Mbps per stream. Still significant, but manageable.

Video calls (Zoom, Teams): 2–8 Mbps per call. HD video calls push towards 8 Mbps, especially with screen sharing.

Online gaming: 3–6 Mbps. Games are surprisingly light on bandwidth — it's latency that matters, not throughput.

Smart home IoT (lights, plugs, sensors): Less than 1 Mbps each. Individually negligible, but 10–15 IoT devices add up.

Security cameras (cloud upload): 2–8 Mbps per camera. This one catches people off guard — three cameras uploading HD footage continuously use 6–24 Mbps of your upload bandwidth.

Music streaming: 0.5–1.5 Mbps. Barely noticeable.

The critical calculation: add up the simultaneous peak usage across all active devices. A household with two 4K streams, a video call, and three security cameras could need 70+ Mbps simultaneously — and that's before anyone downloads anything.

Signs your broadband can't keep up with your smart home:

- Buffering on streaming services, especially during evening peak hours (7–10pm) - Video call quality dropping — pixelated video, robotic audio, disconnections - Smart home devices becoming unresponsive or slow to react - Speed test results significantly below your plan's rated speed - Devices intermittently losing Wi-Fi connection

But here's the thing: most of the time, it's not your broadband plan that's the problem — it's your router or Wi-Fi setup.

Fibre 100 (100/20 Mbps) can theoretically handle 4 simultaneous 4K streams, 5 video calls, 20 IoT devices, and still have bandwidth left over. If you're experiencing slowdowns on Fibre 100 with normal household usage, the bottleneck is almost certainly your Wi-Fi, not your fibre connection.

Cheap routers — including the free ones many ISPs provide — have two key limitations that affect smart homes:

Device capacity: Entry-level routers struggle when more than 15–20 devices are connected simultaneously. The processor can't handle the routing tables, DHCP assignments, and NAT translations for that many connections. Symptoms: slow response times, devices dropping off Wi-Fi, general sluggishness.

Wi-Fi coverage: A single router can't deliver strong signal to every room in a 150m²+ home. Devices at the edges of coverage get slow speeds or intermittent connections. Smart home devices in garages, outdoor areas, or far bedrooms are particularly affected.

The fix isn't upgrading your broadband plan — it's upgrading your router or adding mesh nodes. A good Wi-Fi 6 router ($150–$250) handles 50+ devices without breaking a sweat. A mesh system ($300–$600) ensures coverage reaches every corner.

Practical steps to get the most from your broadband with a device-heavy household:

Separate your IoT network: Create a separate Wi-Fi network (or use your guest network) for smart home devices. This isolates them from your primary devices, improves security, and prevents a misbehaving smart plug from affecting your laptop's connection.

Use 5GHz for high-bandwidth devices: Connect phones, laptops, streaming devices, and gaming consoles to the 5GHz band. Put IoT devices on 2.4GHz — they don't need the speed, and 2.4GHz has better range.

Wire what you can: Smart TVs, gaming consoles, desktop PCs, and streaming boxes should be on Ethernet if possible. Every device you take off Wi-Fi frees up wireless capacity for devices that need it.

Upgrade your router: If you're using an ISP-provided router from 2019 or earlier, a modern Wi-Fi 6 router will handle more devices more efficiently. Wi-Fi 6 was specifically designed for high-density device environments.

Consider a mesh system: For larger homes, mesh nodes extend coverage to every room. Many mesh systems (like TP-Link Deco or Google Nest Wifi) also include built-in IoT network separation.

For most smart homes, the answer is simpler than you think:

Fibre 100 (100/20 Mbps): Handles a household of 1–3 people with 15–25 devices comfortably. Covers multiple streams, video calls, IoT devices, and general browsing without issues. The upload speed (20 Mbps) can get tight if you have multiple cloud-connected cameras.

Fibre 500 (500/100 Mbps): The sweet spot for smart home power users — 4+ people, 25+ devices, multiple security cameras, heavy simultaneous usage. The 100 Mbps upload is the real upgrade here, giving plenty of headroom for camera uploads and video calls.

Fibre 900 or Hyperfibre: Only if you have an exceptionally device-heavy home (50+ devices), multiple 4K security cameras, and several people working from home simultaneously. For the vast majority of smart homes, this is overkill.

Remember: invest in your Wi-Fi setup (router, mesh, Ethernet) before upgrading your broadband plan. A $200 router upgrade often solves problems that a $30/month plan upgrade won't — because the bottleneck was never the fibre connection in the first place.