NBN Throttling: How VPN Can Fix Your Slow Speeds
Your ISP is deliberately slowing you down. Here's how to detect it and what a VPN can do about it.
By Australian VPN
What Is ISP Throttling?
ISP throttling is when your internet provider (Telstra, Optus, TPG, NBN Co, etc.) deliberately slows your connection. Not because your network is congested or you've hit a cap — but intentionally.
Why do they throttle?
- Save bandwidth: When networks are busy, ISPs throttle certain users to free up resources
- Prioritise customers: Some ISPs throttle lower-tier plans to incentivise upgrades
- Prioritise traffic types: Video streaming gets throttled more than browsing to manage congestion
- Shape traffic: Older ISPs throttle torrents or P2P traffic by default
The problem: You're paying for 100 Mbps NBN but getting 30 Mbps. That's throttling.
Is Your NBN Being Throttled?
Here's how to check:
1. Check Your Contract Speed
Log into your NBN account (or your ISP's portal) and check your plan. You should see something like "100 Mbps plan" or "50 Mbps plan".
2. Run a Speed Test
Visit speedtest.net and run a test. Write down your upload and download speeds.
3. Compare Contract vs Actual
If your contract says 100 Mbps but you're getting 30 Mbps (or less than 80% of advertised speed), you're likely being throttled.
4. Test with a VPN (Unofficial Test)
Connect to a VPN and run the speed test again. If you get closer to your advertised speed, your ISP may be throttling specific traffic or users.
Can a VPN Really Fix Throttling?
Partially, yes. Here's the reality:
✓ A VPN CAN help when:
- Your ISP throttles specific traffic types (e.g., torrent downloads or gaming)
- Your ISP throttles certain websites (YouTube, Netflix, gaming servers)
- You're on a limited plan and the ISP throttles after a data threshold
⚠️ A VPN CANNOT help when:
- Your ISP throttles all traffic equally during peak hours
- The NBN network itself is congested (not your ISP's fault)
- Your home broadband plan is genuinely slow (you paid for 50 Mbps, your ISP caps it at 50 Mbps)
Bottom line: A VPN masks your traffic, so the ISP can't see what you're doing. If they're throttling torrents or YouTube, a VPN bypasses that. But if they're throttling your IP address or connection port, a VPN won't help.
Best VPNs for Speed (Low Overhead)
Not all VPNs are created equal. Some add 30% latency, others add 5%. For speed, you want a light-touch VPN:
How to Get Better NBN Speeds (Full Guide)
- Contact your ISP: Tell them your speeds are below contract. They may refresh your line or check for issues.
- Try a VPN: Run a speed test with a VPN connected (to an Australian server). If speeds improve, throttling is the culprit.
- Switch ISPs: If throttling persists, switch to a different NBN reseller. All use the same network, but some are less aggressive with throttling.
- Optimize your network: Use WiFi 6 router, place router centrally, reduce interference.
- Check your plan: Some "100 Mbps" plans are actually slowed by design in peak hours. Read the fine print.
Australian ISP Throttling Stories
Telstra NBN throttling: Known for throttling video streams and torrents during peak hours (6-10 PM).
Optus broadband issues: Optus (before NBN) had a reputation for traffic shaping. Less common now, but still happens.
TPG NBN: TPG often deprioritises heavy users and applies aggressive throttling during congestion.
NBN Co's network congestion: Not throttling per se, but many Australian NBN services suffer from network congestion, especially in peak hours. This is a network issue, not ISP issue.
Key Takeaway
A VPN can sometimes bypass throttling, but it's not a guaranteed fix. If your ISP throttles based on traffic type or website, a VPN helps. If they throttle your connection itself, a VPN won't.
First step: Test with a VPN to confirm throttling. Then contact your ISP.