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Terminal tabs can become very sluggish/unresponsive #11859

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opened 2026-01-31 02:59:28 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 02:59:28 +00:00
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Originally created by @NeilMacMullen on GitHub (Dec 23, 2020).

Environment

Win32NT             10.0.19042.0 Microsoft Windows NT 10.0.19042.0
Windows Terminal Preview Version: 1.5.3242.0

Steps to reproduce

Open a windows terminal with multiple tabs (In my case 4 powershell tabs). At least one of the tabs should produce large amounts of output.

Expected behavior

Switching between tabs should be fast and fluid

Actual behavior

Over time (6-24 hours) , the terminal becomes slower and slower to respond to clicks on the tab headers - eventually it can take >10 seconds to switch tabs after a click. The '+' and "open menu" controls in the title bar are similarly unresponsive.

Even if all the tabs are removed and new empty tabs are added, switching remains extremely slow. Note that the problem is limited to the particular terminal instance though - if another instance is opened on the same machine, it is performant and other applications are responsive. Task manager shows no obvious CPU/Memory load.

Originally created by @NeilMacMullen on GitHub (Dec 23, 2020). <!-- This bug tracker is monitored by Windows Terminal development team and other technical folks. **Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**. Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue. If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment ``` Win32NT 10.0.19042.0 Microsoft Windows NT 10.0.19042.0 Windows Terminal Preview Version: 1.5.3242.0 ``` # Steps to reproduce Open a windows terminal with multiple tabs (In my case 4 powershell tabs). At least one of the tabs should produce large amounts of output. # Expected behavior Switching between tabs should be fast and fluid # Actual behavior Over time (6-24 hours) , the terminal becomes slower and slower to respond to clicks on the tab headers - eventually it can take >10 seconds to switch tabs after a click. The '+' and "open menu" controls in the title bar are similarly unresponsive. Even if all the tabs are removed and new empty tabs are added, switching remains extremely slow. Note that the problem is limited to the particular terminal instance though - if another instance is opened on the same machine, it is performant and other applications are responsive. Task manager shows no obvious CPU/Memory load.
claunia added the Needs-TriageNeeds-Tag-Fix labels 2026-01-31 02:59:28 +00:00
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Reference: starred/terminal#11859
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