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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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager-openvpn in Ubuntu.
https://bugs.launchpad.net/bugs/1870043

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

Status in network-manager-openvpn package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 19.04, Wayland, Gnome shell, Dash to panel 31

  Hello,

  Every morning when I resume my computer, the notification panel is full with 
notifications about the VPN I use for daily work. The notification are emited 
at system resume and VPN connection loss.
  It makes my system laggy when I open the notification panel and I miss the 
other notifications because they are lost in the stream.

  Could you keep only one or two notifications about the connection loss ?
  There is also room to improve notification display performance because it 
seems to be restricted to the 30 last ones, but my mouse still becomes jerky 
when the notification panel is open.
  Thanks for your incredible work

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