Netflix 4K HDR needs a minimum of about 25Mbps (50Mbps+ comfortable); YouTube 4K needs around 20Mbps. Two people streaming 4K at once really wants an NBN 100+ plan. If you're already above these numbers and still buffering: switch to Ethernet, check nothing else is hogging bandwidth (background downloads, torrents), and confirm during peak hours (7–10pm) whether it's an ISP congestion issue rather than your home setup.
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