NBN Slow After Installation? Here’s How to Fix It

So, you’ve finally made the switch to the NBN — Australia’s national broadband network — expecting lightning-fast speeds, seamless streaming, and smooth online gaming. But instead, you’re faced with frustratingly slow internet. Pages take forever to load, Zoom calls keep dropping, and streaming HD content feels like a distant dream. If this sounds familiar, you’re not alone.

Many Australians report slow NBN speeds shortly after installation. But the good news? In most cases, the problem isn’t permanent — and can often be fixed with a few smart tweaks.

In this comprehensive blog post, we’ll explore:

• Why your NBN might be slow after installation

• How to troubleshoot and fix common issues

• When it’s time to call your provider or escalate the issue

• Pro tips to get the most out of your NBN connection

Let’s dive in.

Why Is My NBN Slow After Installation?

Before you can fix a slow NBN connection, it helps to understand why it might be underperforming in the first place. There are a range of possible culprits, including:

1. The Type of NBN Technology You Have

Not all NBN connections are created equal. The NBN rollout used a mix of technologies under the Multi-Technology Mix (MTM) approach. Some are faster and more reliable than others.

Here’s a quick comparison:

NBN Technology	Description	Max Speed Potential
FTTP (Fibre to the Premises)	Fibre optic all the way to your home	Up to 1000 Mbps
FTTN (Fibre to the Node)	Fibre to a nearby node, then copper wires	Up to 100 Mbps, often lower
FTTC (Fibre to the Curb)	Fibre to the street curb, then short copper run	Up to 100 Mbps
HFC (Hybrid Fibre Coaxial)	Uses old Pay TV cables	Up to 250 Mbps, but can be congested
Fixed Wireless / Satellite	Used in regional or remote areas	Up to 25–50 Mbps (less reliable)

If you’re on FTTN or Fixed Wireless, your slow speeds might stem from the limitations of the technology itself.

2. Your Internet Plan

Did you sign up for the lowest-tier NBN plan? The basic plan offers speeds of NBN 12 (up to 12 Mbps) — which is barely enough for a household of two, let alone a family of Netflix users and gamers.

3. Modem or Router Issues

Your modem is the gateway to your digital world. If it’s outdated, misconfigured, or poorly located, it can cause significant speed drops.

4. Wi-Fi vs Ethernet

Wi-Fi is convenient, but it’s also prone to interference, signal drops, and range issues. An Ethernet (wired) connection is almost always faster and more reliable.

5. Peak Hour Congestion

Between 7 PM and 11 PM, many Australians hop online — streaming, gaming, and browsing. If your provider hasn’t purchased enough bandwidth (CVC capacity) from NBN Co, you’ll experience evening slowdowns.

6. Device Overload

Too many devices competing for bandwidth can choke your internet speed. Smart TVs, phones, laptops, security cameras, and gaming consoles — they all add up.

How to Fix a Slow NBN Connection After Installation

Now that we’ve identified the likely causes, let’s get into practical fixes.

1. Run a Speed Test

Before changing anything, you need to know your current speeds.

• Visit Speedtest.net or Fast.com from a wired connection if possible.

• Test at different times of the day, especially during peak hours.

Compare the results with the speeds promised in your NBN plan.

2. Check Your NBN Plan

Make sure you’re on a speed tier that suits your usage. Here’s a quick guide:

Plan Tier	Typical Use
NBN 12 (Basic I)	Light browsing, emails
NBN 25 (Basic II)	Single user, basic streaming
NBN 50 (Standard)	Families, HD streaming, video calls
NBN 100 (Fast)	Gamers, 4K streaming, multiple users
NBN 250/1000 (Superfast/Ultrafast)	Heavy usage, large households, professionals

If you’re on a low-tier plan, upgrade to at least NBN 50 for a better experience.

3. Restart Your Modem and Router

Yes, the old “turn it off and on again” actually works!

• Turn off your modem and router

• Wait 60 seconds

• Turn them back on and wait for a full reboot

This clears memory and resets network settings that may be bogging down your connection.

4. Position Your Modem Correctly

Poor placement can drastically affect Wi-Fi performance. Best practices include:

• Central location in your home

• Elevated position (not on the floor)

• Away from walls, microwaves, and metal objects

If needed, use Wi-Fi mesh systems or range extenders to cover larger homes.

5. Use Ethernet for Key Devices

Whenever possible, connect critical devices like your PC, gaming console, or smart TV using a LAN cable. This eliminates the variability of Wi-Fi.

6. Update Your Firmware

Old modem/router firmware can cause instability. Check your device settings or manufacturer website for updates.

7. Check for Background Downloads

Your devices could be quietly hogging bandwidth with:

• System updates

• Cloud syncs (Google Drive, OneDrive, iCloud)

• Streaming services buffering content

Pause or schedule these outside peak hours.

8. Scan for Malware

Viruses and malware can use your internet connection without your knowledge. Run a full system scan using reliable antivirus software.

9. Contact Your Provider

If nothing helps, it might be time to escalate:

• Ask your ISP if there are known outages or congestion issues

• Request a line test to check for signal quality or faults

• Ask about upgrading to a higher CVC provider plan if congestion is an issue

10. Request a Technology Upgrade (FTTP Upgrade Program)

If you’re stuck on FTTN or other limited technologies, check if you’re eligible for a free fibre upgrade under NBN Co’s Fibre Connect program. You’ll need to:

• Be in a designated upgrade area

• Order a qualifying high-speed plan (e.g., NBN 100 or higher)

• Work with your ISP to schedule the installation

Bonus Tips: How to Future-Proof Your Home Internet

Even after resolving speed issues, it’s worth preparing for future needs:

• Invest in a high-performance modem/router with Wi-Fi 6 support

• Use network monitoring tools to keep an eye on usage patterns

• Set up Quality of Service (QoS) to prioritise bandwidth to key devices

• Split Wi-Fi into 2.4GHz and 5GHz bands for better device management

• Install smart home network switches for flexible wired connections

Final Thoughts: Don’t Settle for Sluggish NBN

Slow speeds after NBN installation are incredibly frustrating — but they’re not a dead end. From optimising your in-home setup to upgrading your plan or tech, there’s a lot you can do to improve performance.

And remember: you’re paying for a service. If your ISP isn’t delivering the speed you’re paying for, hold them accountable. Ask for help, file complaints with the TIO (Telecommunications Industry Ombudsman) if needed, and shop around if things don’t improve.

With the right fixes, your NBN connection can go from sluggish to supercharged. Contact Data Cabling Guy for all your cabling needs.