After applying the filter, fop2_server and plugin are stable, avg. CPU load - 5%.
Thank you for help.
read = system,call,log,verbose,command,agent,user,config,command,dtmf,reporting,dialplan,originate
write = system,call,log,verbose,command,agent,user,config,command,dtmf,reporting,dialplan,originate
eventfilter=!Event: RTCPSent
eventfilter=!Event: RTCPReceived
eventfilter=!Event: VarSet
eventfilter=!Event: Cdr
eventfilter=!Event: ExtensionStatus
eventfilter=!Event: ChannelUpdate
eventfilter=!Event: PeerStatus
eventfilter=!Event: Masquerade
eventfilter=!Event: Registry
eventfilter=!Event: QueueMemberStatus
eventfilter=!Event: JitterBufStats
eventfilter=!Event: Reload
eventfilter=!Event: ChannelReload