Please see the attachment.

I just tested with dash to panel disabled, the performance slowdown
remains (2 or 3 seconds before the notification panel opens, and the the
mouse is jerky when passing over the notifications).

So I think there are 2 issues :
- too many network notifs with network-manager-openvpn
- gnome slowdown when there are many notifications

I don't know if this is related, but network-manager-openvpn doesn't deal 
correctly with the DNS configuration, so I currently modify manually 
/etc/resolv.conf to add my enterprise DNS servers IP addresses once I'm 
connected (with a keyboard shortcut).
This means that after the VPN connection, the DNS might be the wrong one for a 
few seconds/minutes.
I made this script : #!/bin/bash
echo -e 'nameserver SERVER1\nnameserver SERVER2\nsearch lan' > /etc/resolv.conf


** Attachment added: "journal.txt"
   
https://bugs.launchpad.net/ubuntu/+source/network-manager-openvpn/+bug/1870043/+attachment/5344313/+files/journal.txt

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https://bugs.launchpad.net/bugs/1870043

Title:
  To many notifications “Activation of network connection failed" with
  network-manager-openvpn

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