You might want to take a look at: Timer too close and Advanced Trouble-Shooting / Graphing Klipper
You’ve graphed the MCU load, but it’s really the system load you want to look at:
Seems to me that your host linux machine is memory “swapping”. It’s hard to say why that is - maybe something else is running on the machine and consuming resources.
Separately, it also seems like the cpu load is high - perhaps some other process is also consuming cpu utilization - or perhaps the host machine is not powerful enough.
-Kevin