Hello to the forum,
I see an high CPU usage on Routerboard 450G with ROS 6.27 and FW 3.22.
Here a screenshot, this is the first time I see voltage IRQ on RB.
I see poor tput on the RB, i'm investigating if this can slow down the 450.
Many thanks for support.

P.S. I have another RB450G, similar conf, but with ROS 6.20, and there isn't any IRQ Voltage
Here the second RB:

active

It's a long time since your post. But maybe you got an explanation for the high voltage load. I've got the same on my RB450G with RouterOS 6.46.5.
Or maybe there's a Mikrotik engineer that loves to tell tales out of school.