High WCPU for [intr{swi4: clock (0)}]

[buggy09]

OpnSense is installed on SuperMicro SuperServer 5018D-FN8T with Xeon D-1518 CPU.
Everything works fine, but even in idle, [intr{swi4: clock (0)}] shows WCPU abt 10.0% all the time.

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PID USERNAME PRI NICE SIZE  RES    STATE   C    TIME      WCPU     COMMAND
11   root    155 ki31 0   128K   CPU0    0 330.2H    100.00%  [idle{idle: cpu0}]
12   root    -60  - 0   1328K  WAIT    5 35.3H      10.57%  [intr{swi4: clock (0)}]


Same config on chinese Mini PC based on Celeron J1900 shows WCPU for same process less then 1%.

Is it normal ? Load average showing on Dashboard is about 0.5 (8 cores CPU).