risposta dal mio server che non ci capisco una mazzaaaaaaaaa nemeno facendo la traduzione con google
Every 500ms the throttling daemon checks to see how much collective resources your account username is requesting or utilizing. If this exceeds 7% of total system resources, we "jail" your user to a single core; Meaning you may no longer pull from the total pool of CPU resources, and are isolated to a single CPU core with other jailed users. Once jailed we allow you to use 100% of that core's available resources. If in another 500ms window your load requests have dropped below the 7% threshold for 500ms or more, we'll "un-jail" you and put you back with the collective CPU resources pool.
It is completely software-controlled and the transition from CPU jailing and back is seamless. The only time CPU throttling will cause you issues is if your site is consistently being jailed, THEN using all the available CPU cycles of the core you're jailed to.
We have a really great article in our helpdesk that goes over some options to help reduce throttling.
You will also want to make sure that all of your themes/plugins/widgits are also up to date. I have also found that if you remove any themes/plugins/widgits that you are not using, instead of just deactivating them, that will also help to prevent throttling.