CCR1036 openVPN and multithreading

Hi everybody!
I united all my vpn tunnels at one CCR. And i was happy before i noticed such thing. My tunnels use only one core at 100%, other are used only at 0-4%
Test stand consist of one CCR1036-8G-2S+ Firmware 3.27. Ros 6.33.3(stable), 6 ovpn tunnels (two rb951ui-2hnd and four x86 Ros).
Maybe, it is possible somehow to switch on “multithreading support” or something like that? Is there any specifics on setting up openVPN on Mikrotik CCR?
Thank you for your time.
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