Seems on kernel of Leap 15.4 (5.14.21-150400.24.21-default) it happens less often. Much better now it seems, but this needs more testing. But still sometimes things are getting slow and CPU speed stays at 400 MHz. This is with "intel_idle.max_cstate=0". No thermald running apparently, but I found in 'ps' (didn't see this before because I grepped for thermald): root 801 0.0 0.0 0 0 ? I< 10:33 0:00 [acpi_thermal_pm]