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Viscosity service has very high cpu load

Hello there,

I am very happy with viscosity. But recently I had recurring problems with the viscosity background service.

Every few days, the service uses more and more cpu, up to the point where the system is nearly non-responsive.
I can kill the process und restart viscosity and all connections, but this in very inconventient.

The system is running thoughout the work-week and I keep 1-2 connections open to my servers. But this should be no problem per se, and I did this without problems with other vpn clients.

I could not find anything like that in your support pages or with google.

Is there anything I can do? Is this an known issue?

Hi Gali,

There is no known issue like this, very strange. Are you able to let us know the version of Viscosity, .NET and Windows you are using? These are both printed out in the log when you first connect for an easy place to find them.


I have the same problem. It is occurring since the last Windows 10 updates a few weeks ago.
Viscosity service produces high CPU load when connected, otherwise it sleeps.
My Windows version: Windows 10 Pro, build 17134
Viscosity: 1.7.12 (1581)
.NET Framework 4.7.2

Hi Mitja,

As a test, do you see the same high CPU load if you change your DNS mode to Disabled? To do this, edit your connection, go to Networking and change the DNS Mode to Disabled, save your connection and then connect again.

Wait a minute or two and see if the CPU usage still spikes, then you will probably want to change this back to what it was.


this workaround indeed solved the problem.
With "DNS mode" set to disabled, CPU does not spike neither due to traffic over VPN connection, nor
due to other network traffic.

Thank you and regards,
Hi zmitja,

Please familiarise yourself with the DNS modes to ensure you are happy to continue to use Disabled - ... #dns-modes

It sounds like you must have an extreme amount of DNS traffic, I recommend scanning for viruses or malware. If the problem persists, please let us know and we'll get some debug data from you to see if we can help you diagnose it.

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