I cleaned tomcat work and temp directory and restart my server.
CPU is calm after that.
javameldoy displayed 0 current request.
With Admin account I can watch my xwiki web site without problem BUT as soon I’m going on my Admin profile: Notifications, my CPU is at 100% again and didn’t decrease anymore!
And javamelody displayed 3 current request on
https://xxxx.fr/bin/get/XWiki/Notifications/Code/NotificationsDisplayerUIX?outputSyntax=plain&action=getUnreadCount&_=1551817954039
.