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Experimental Shaders also render on Tabs that aren't active / Minimized Windows #19974

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opened 2026-01-31 06:59:09 +00:00 by claunia · 2 comments
claunia commented 2026-01-31 06:59:09 +00:00
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Originally created by @TsengSR on GitHub (May 25, 2023).

Windows Terminal version

1.18.1421.0

Windows build number

10.0.22621.0

Other Software

crt.hlsl shader from https://github.com/Hammster/windows-terminal-shaders

Steps to reproduce

Set crt (or any other shader) shader as experimental

    "profiles": 
    {
        "defaults": 
        {
            "experimental.pixelShaderPath": "C:\\Projekte\\repos\\windows-terminal-shaders\\crt.hlsl",
            "font": 
            {
                "face": "MesloLGS NF"
            }
        },
        "list":

and open multiple tabs. With 7 tabs I have constant GPU usage of 20%. With 20-30 its close to 100 %, even when minimized.

Expected Behavior

Tabs that are not actively selected or visible (or Terminal windows which are minimized) shouldn't render shaders all the time.

Actual Behavior

With each new tab GPU CPU grows up, even when minimized or not active.

image

With 20+ tabs
image

Originally created by @TsengSR on GitHub (May 25, 2023). ### Windows Terminal version 1.18.1421.0 ### Windows build number 10.0.22621.0 ### Other Software crt.hlsl shader from https://github.com/Hammster/windows-terminal-shaders ### Steps to reproduce Set crt (or any other shader) shader as experimental ``` "profiles": { "defaults": { "experimental.pixelShaderPath": "C:\\Projekte\\repos\\windows-terminal-shaders\\crt.hlsl", "font": { "face": "MesloLGS NF" } }, "list": ``` and open multiple tabs. With 7 tabs I have constant GPU usage of 20%. With 20-30 its close to 100 %, even when minimized. ### Expected Behavior Tabs that are not actively selected or visible (or Terminal windows which are minimized) shouldn't render shaders all the time. ### Actual Behavior With each new tab GPU CPU grows up, even when minimized or not active. ![image](https://github.com/microsoft/terminal/assets/10427430/b583107c-81ba-48a2-a8b4-0df1a0f501c8) With 20+ tabs ![image](https://github.com/microsoft/terminal/assets/10427430/2b4dd7eb-f7b2-4787-8199-dfc697565c02)
claunia added the Issue-BugResolution-Duplicate labels 2026-01-31 06:59:09 +00:00
claunia commented 2026-01-31 06:59:10 +00:00
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@zadjii-msft commented on GitHub (May 25, 2023):

I'm gonna reckon this should be marked as a /duplicate of #1989. Not only should we stop rendering the shaders, we should just do nothing at all for hidden tabs

@zadjii-msft commented on GitHub (May 25, 2023): I'm gonna reckon this should be marked as a /duplicate of #1989. Not only should we stop rendering the shaders, we should just do _nothing at all_ for hidden tabs
claunia commented 2026-01-31 06:59:10 +00:00
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@microsoft-github-policy-service[bot] commented on GitHub (May 25, 2023):

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!

@microsoft-github-policy-service[bot] commented on GitHub (May 25, 2023): Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!
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Reference: starred/terminal#19974
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