Traffic chart is broken in GUI

[skarlheinz-hue]

Is there an existing issue for this?

• I have searched the existing issues.

What's the problem?

How did you install the app?

downloaded one of the provided packages

Operating System

Windows

Additional context

No response

[GyulyVGC]

Hey @skarlheinz-hue thanks for taking the time to open this issue

It seems to be a problem with the graphical renderer in use.

Please try setting the environment variable ICED_BACKEND=tiny-skia and retry.
This tells the app to use the fallback graphical renderer.

[PowerLos]

The variable was set, and the computer was restarted.
The problem persists.

C:\Users\KHS>set
ALLUSERSPROFILE=C:\ProgramData
APPDATA=C:\Users\KHS\AppData\Roaming
CommonProgramFiles=C:\Program Files\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
ComSpec=C:\WINDOWS\system32\cmd.exe
DriverData=C:\Windows\System32\Drivers\DriverData
HOMEDRIVE=C:
HOMEPATH=\Users\KHS
ICED_BACKEND=tiny-skia

[GyulyVGC]

On which version of Windows are you running? Please also verify your graphical drivers are up to date.

[PowerLos]

Windows Version is "Microsoft Windows [Version 10.0.19045.6466]" inside VmWare.
Installed VmWare-Tools:

[GyulyVGC]

The fact you're running it inside VmWare could be an explanation of the issue.

[skarlheinz-hue]

Ok, i understand, but i have another installation under VmWare with Windows Server 2025 and everything is fine there.

[GyulyVGC]

I'm afraid I can't do much on my end in these cases, since everything comes down to iced rendering capabilities.

However, I'd be curious to hear if graphical problems only manifest in the "Traffic rate" chart or also in the donut chart to the left, and traffic previews charts in the initial page of the app.

[skarlheinz-hue]

Another installation in VmWare with Windows 11.
First everything is ok, but after changing language and zoom level does that happen:

[GyulyVGC]

Mm, also the donut chart doesn't show. So it's a problem with rendering of Iced's Canvas

[amaa-99]

Hi. I've got a similar issue on a VirtualBox Linux VM client (Ubuntu 26.04. Wayland, KDE Plasma Desktop).
Starting Sniffet with $ WGPU_BACKEND=vulkan sniffnet seems to mitigate the problem.

p.s. I've executed a few OpenGL tests (hardinfo2, glxgears, Furmark...) and didn't observe any rendering errors or artifacts.

[PowerLos]

I think the problem is caused by zooming.

[amaa-99]

I've tested with zoom at 100% (using the default backend):

...and at 50%:

With WGPU_BACKEND=vulkan both cases got rendered correctly.