{"id":31108,"date":"2026-10-14T10:02:00","date_gmt":"2026-10-13T23:02:00","guid":{"rendered":"https:\/\/www.letsbemates.com.au\/mate\/?p=31108"},"modified":"2026-10-14T10:02:00","modified_gmt":"2026-10-13T23:02:00","slug":"why-is-my-nbn-slow-at-night","status":"publish","type":"post","link":"https:\/\/www.letsbemates.com.au\/mate\/why-is-my-nbn-slow-at-night\/","title":{"rendered":"Why Is My nbn Slow at Night? Real Causes and Fixes | MATE"},"content":{"rendered":"

Why your nbn slows down at night, and what you can actually do about it<\/span><\/h1>\n

It\u2019s 8pm. You\u2019ve finally sat down to watch something, and the little loading wheel shows up again. Sound familiar?<\/span><\/p>\n

For years, the answer was simple: everyone was online at once and the network couldn\u2019t keep up. In 2026, that\u2019s no longer the usual story. Here\u2019s what\u2019s really going on, how to work out the cause in five minutes, and the fixes that actually work.<\/span><\/p>\n

The short answer<\/span><\/h2>\n

Peak-hour congestion on the nbn has largely been engineered out. The ACCC\u2019s final broadband report found fixed-line services delivering 99.4% of plan speed in the busy evening hours. So if your internet slows down at night, the cause is most often WiFi interference, too many active devices, or a line technology that can\u2019t sustain your plan speed.<\/span><\/p>\n

What used to cause it, and what changed<\/span><\/h2>\n

Until recently, nbn charged internet providers for the bandwidth they used through a fee called CVC (Connectivity Virtual Circuit). Providers had to decide how much capacity to buy, and when they didn\u2019t buy enough, everyone\u2019s speeds dropped during the busy evening hours. That\u2019s where the nbn\u2019s reputation for slow nights came from.<\/span><\/p>\n

That model is gone. nbn removed CVC charges for plans of 100Mbps and above in December 2023, and for the remaining fixed-line and fixed wireless tiers from 1 July 2026. Bandwidth is now included in a flat wholesale price, so providers no longer have the same cost pressure to ration it at peak times.<\/span><\/p>\n

The results show it. When the ACCC started measuring broadband performance in 2017, average busy-hour speeds were around 80 to 85% of plan speeds. In its final Measuring Broadband Australia report in June 2026, fixed-line services were averaging 99.4% of plan speed during the peak evening period, and the share of underperforming services had dropped from 13.9% in 2018 to 5.6%.<\/span><\/p>\n

Diagnose it in five minutes<\/span><\/h2>\n

Before you change anything, find out where the slowdown is actually happening. All you need is a laptop, an Ethernet cable and a speed test website or app. Run each test at night, when the problem shows up.<\/span><\/p>\n

    \n
  1. Test wired, next to your router.<\/b> Plug your laptop straight into your modem\/router with an Ethernet cable and run a speed test. This shows what your nbn connection is delivering, with WiFi taken out of the picture.<\/span><\/li>\n
  2. Test on WiFi, in the same room.<\/b> Unplug the cable and run the same test over WiFi, standing near the router. This shows how much speed your router\u2019s WiFi is losing.<\/span><\/li>\n
  3. Test on WiFi, in the problem room.<\/b> Move to the room where things are slowest, like the bedroom or back lounge, and test again. This shows how much your WiFi signal drops with distance and walls.<\/span><\/li>\n
  4. Test again at a quiet time.<\/b> Repeat the wired test at a quiet time, like mid-morning on a weekday. This shows whether the evening itself is making a difference.<\/span><\/li>\n<\/ol>\n

    What your results tell you:<\/b><\/p>\n