RB3011 CPU problem with PPPOE

Hello,

I have an RB3011 and connect to ISP 1gb/s with pppoe client.

Problem is the speed and it is maxim ~650mb/s without fast track.
I bought this powerful router for not using it fast track
Strange problem is CPU because use just 1 core 100%

P.S. I make another test without pppoe and works fine (CPU use both cores) and traffic is ~950mb/s

Please Does anyone have any idea how i could solve this ?

Best Regards,
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Hello,

I make other test with CCR 1016 and works fine. Router use all core with PPPOE
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Regards