fail2ban high usage

[Bubblecatcher]

Hi, i have new created server with debain 9 and vestacp installed, i noticed that fail2ban is using lot of resources, which it is not on the server i am migrating from which is debian 7 ispconfig3.

screenshot
https://photos.app.goo.gl/NbWrFXx5nk7iLcQf8

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service fail2ban status
● fail2ban.service - Fail2Ban Service
   Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-08-21 23:35:22 BST; 22h ago
     Docs: man:fail2ban(1)
  Process: 525 ExecStart=/usr/bin/fail2ban-client -x start (code=exited, status=0/SUCCESS)
 Main PID: 825 (fail2ban-server)
    Tasks: 11 (limit: 4915)
   CGroup: /system.slice/fail2ban.service
           └─825 /usr/bin/python3 /usr/bin/fail2ban-server -s /var/run/fail2ban/fail2ban.sock -p /var/run/fail2ban/fail2ban.pid -x -b

Aug 21 23:35:21 server.host.com systemd[1]: Starting Fail2Ban Service...
Aug 21 23:35:22 server.host.com fail2ban-client[525]: 2018-08-21 23:35:22,387 fail2ban.server         [663]: INFO    Starting Fail2ban v0.9.6
Aug 21 23:35:22 server.host.com fail2ban-client[525]: 2018-08-21 23:35:22,387 fail2ban.server         [663]: INFO    Starting in daemon mode
Aug 21 23:35:22 server.host.com systemd[1]: Started Fail2Ban Service.

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fail2ban.conf 
[Definition]
loglevel = INFO
logtarget = /var/log/fail2ban.log
syslogsocket = auto
socket = /var/run/fail2ban/fail2ban.sock
pidfile = /var/run/fail2ban/fail2ban.pid
dbfile = /var/lib/fail2ban/fail2ban.sqlite3
dbpurgeage = 86400

fail2ban log full of

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2018-08-22 22:24:09,744 fail2ban.filter         [825]: INFO    [exim-iptables] Ignore 127.0.0.1 by ip

any ideas?

thanks