Hey @Bernardes ,
So, there is no such thing like "discover the exact moment that the high CPU usage starts to compare with some rule or something like that" .
From the pictures, I can say that the number of CPU's seems a bit low - for me at least - considering how much traffic you have there - like 3-5Gb one way and 300-600K packets .
Also you seem to have ALL POSSIBLE BLADES enabled, is that really needed .
For the access list installation, it's normal to fail, when the system is loaded - and in your case the CPU is HIGH on couple of processors out of 8.
You should provide more details on what you are trying to achieve, is the 5Gb sustained traffic normal for that environment? Is the box sized correctly ?
Thank you,