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https://issues.apache.org/jira/browse/GUACAMOLE-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16259605#comment-16259605
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Matt Prager commented on GUACAMOLE-340:
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I use Guacamole to remote in to a number of different machines, some of them
RDP and 2 of then VNC. The RDP works flawlessly as does VNC to a different
Ubuntu VM (with a GUI). I don't think it's an underlying CPU/RAM issue because
I have no problem running multiple concurrent RDP and VNC sessions to different
machines in different browser tabs. Network traffic isn't an issue either as
the VM that's running Guacamole has a dedicated GigE hardwired LAN connection
so there's no traffic on it really other than the bits being generated by the
Ubuntu server.
The VNC I'm experiencing the issue with is to a Windows 10 machine running UVNC
as a server. As I mentioned in my initial posts, accessing this machine using
other VNC clients on both Chrome OS and Android run fine and without the
problem I saw when using Guacamole. Again, I don't know if the problem is with
Guacamole or the underlying libvnc libraries, but there's something strange
going on because, in addition to the black splotches mentioned above, there's a
noticeable lag - like up to 10 or 15 seconds - on initial connect and a lag
with mouse movements. Again, is is only when using Guacamole; this lag doesn't
exist when using other VNC clients to connect to the same machine nor does this
lag exist when using RDP to connect to this same machine.
Is there any other debugging or log collecting I can do that would show you
what's happening during that lag time and that might ultimately point to the
source of the problem?
> VNC slow and much of screen is black
> ------------------------------------
>
> Key: GUACAMOLE-340
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-340
> Project: Guacamole
> Issue Type: Bug
> Affects Versions: 0.9.12-incubating
> Environment: ChromeOS
> Reporter: Matt Prager
> Attachments: Screenshot 2017-07-06 at 9.33.46 AM.png, Screenshot
> 2017-07-06 at 9.34.16 AM.png
>
>
> The screenshots below show the issue best. Exact same computer and server. In
> one screenshot, using RealVNC's viewer, it looks great; using Guacamole, it's
> covered with black splotches. I'm not sure how to debug this as it's
> obviously not an issue with the connection or the VNC server (I'm using
> UltraVNC) since the one viewer works fine, but let me know what information
> you need to help figure out why this is happening.
> My VNC settings in Guacamole are nothing more that the minimum required
> (port, username, password).
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