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High CPU usage with fast.com on AC87U and 380.68_2

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Ryo99

New Around Here
Hi.

I'm noticing odd behaviour in CPU usage when doing a speedtest with fast.com, the CPU usage will skyrocket on Core 1, jumping at first to 70% then going right to 99% until the test is done. QoS is off.

Other speed tests do not cause the cpu usage to soar. Only fast.com from what I have observed.

Details - AC87 with 360.68_2
- Gigabit WAN, ISP is 1000/50
- QoS is off.
- Using fast.com while wired
- IPV6 is on. Native.
- VPN and TOR off
- Nat Auto - CTF (Cut Through Forwarding) and FA (Flow Acceleration) accelerator are enabled.
- App Analysis is off
- Traffic Analyzer off

Any explanation or insight into what could be happening?
 

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