You will need to consider the latency as a variable as well. Check this document as it might be helpful: https://bradhedlund.com/2008/12/19/how-to-calculate-tcp-throughput-for-long-distance-links/
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First things first! Is this affecting wired devices as well or just the ones over WiFi? Can you test it with a PC on a vlan(other than 1) without RADIUS auth? What happens after 5 minutes of inactivity, does the PC goes to sleep?
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Have you tried blocking the IP from Security & SD WAN -> Configure -> Firewall and adding a rule in inbound rule? Details on using layer 3 firewall rules.
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