8 seconds lag always after few minutes without script activation

Setup, Configuration and Use Scripts & Rules
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11

I mean 3-5 minututes is the time after which I need to wait another 8 seconds between trigger and first reaction of rule.

I have full awareness of this and always let the rule load for the first time after edit or restart and my observations starting later.

I removed all my rules file from rules directory, created new file and put inside it part with corridor rule as below. Now the lag after 3-5 min is about 1.2-1.5 second. It’s weird…

rule Pir_Corridor_On
when
  Item Corridor_MotionSensor changed to ON
then
  logInfo("Pir", "Corridor: Korytarz - ruch, jasnosc: " + Corridor_MotionSensor_Luminance.state)

  logInfo("Pir", "Corridor: Aktywacja swiatla w trybie dzien")
  
  sendCommand(Corridor_Ambiance_4, 100)
  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_3, 100)
  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_2, 100)
  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_1, 100)
end

rule Pir_Corridor_Off
when
  Item Corridor_MotionSensor changed to OFF
then
  logInfo("Pir", "Corridor: Korytarz - koniec ruchu, jasnosc: " + Corridor_MotionSensor_Luminance.state)

  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_1, 0)
  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_2, 0)
  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_3, 0)
  Thread::sleep(300)
  sendCommand(Corridor_Ambiance_4, 0)
end

And next observation, now I put into my only one rules file two simpler rules as below. In that case there is very small lag, about 250ms. If I fast turn on and off the source item there is no lag at all so the problem still exists.

var String ir_path = "/etc/openhab2/ir_sequences/ir_sequences.sh "

rule "Ir_Music_On"
when
    Item IR_Music received command ON
then
    logInfo("Pir", "Start of Ir music on rule")
    executeCommandLine(ir_path + "JVC-Aux", 5000)
end

rule "Ir_Music_Off"
when
    Item IR_Music received command OFF
then
    logInfo("Pir", "Start of Ir music off rule")
    executeCommandLine(ir_path + "JVC-Power", 5000)
end