Question Plesk with 100% CPU usage

[dvl]

Hello,
Can someone tell me what happens with websites and Panel if CPU is 100%. Are they offline o what?
Plesk is on VPS , phisical CPU is Intel Xeon E52650 @2.6GHz, 8GB RAM has VPS, About 50 domains.
10Gbs conection.

 

[Bitpalast]

Your websites won't be offline just because CPU is utilized 100%. However, the response time can increase a great deal. A "very long" response time can lead to time out errors which can make it feel as if the server was offline. What are the 50 domains doing? Are they parked with some websites? What is on the websites, e.g. a shop, forum or just some Wordpress or similar?