plasmashell cpu usage

[Oleksandr Kryvulia]

After recent upgrade plasmashell and system clock process started 
consuming a lot of cpu:

  PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME    WCPU 
COMMAND
   11 root         12 199 ki31     0B   192K RUN      0  11:45 974,61% idle
    2 root         12 -50    -     0B   192K CPU0     0   0:46 100,40% clock
62541 o.kryvulia   23  59    0  1439M   419M CPU3     3   0:42 100,02% 
plasmashell
95957 o.kryvulia    5   0    0   428M   196M select  11   0:01   2,12% 
konsole
67567 root          7   0    0   286M   146M select  10   0:01   0,29% Xorg
   12 root         53 -54    -     0B   848K WAIT     2   0:00   0,24% intr
2317 root          1   0    0    15M  4220K CPU4     4   0:00   0,12% top
31319 o.kryvulia    1   0    0    15M  4548K select   5   0:00   0,06% 
dbus-daemon
40246 o.kryvulia    9   0    0    65M    21M select   4   0:00   0,06% 
xdg-desktop-portal

Also I see a lot of interrupts genegated by cpu0:timer:

# vmstat -i
interrupt                          total       rate
irq1: atkbd0                        1152          2
irq9: acpi0                         1690          3
irq12: psm0                           96          0
irq27: ig4iic0                     12651         23
irq56: iichid0                     12630         23
cpu0:timer                     948004866    1735681
cpu1:timer                         52907         97
cpu2:timer                        250166        458
cpu3:timer                        251124        460
....

What could be causing this?

FreeBSD 16.0-CURRENT #13 main-n284403-895a97c875a0
plasma6-plasma-workspace-6.6.2