lagging system #38559

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1. nukfulkchkbuk

   added

   appIssues related to the Codex desktop appIssues related to the Codex desktop app

   on Aug 14, 2026
2. github-actions

   added

   bugSomething isn't workingSomething isn't working

   windows-osIssues related to Codex on Windows systemsIssues related to Codex on Windows systems

   performance

   on Aug 14, 2026
3. github-actions commented on Aug 14, 2026

   

   github-actionsBot

   on Aug 14, 2026 – with GitHub Actions

   Contributor

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   Potential duplicates detected. Please review them and close your issue if it is a duplicate.

   • After the update to Windows 11, the mouse has become noticeably sluggish. #38556
   • [Windows][26.810.4967.0] This update makes the entire PC stutter — fully exiting Codex fixes it immediately #38554
   • # Windows desktop app 26.810.4967.0 continuously uses high CPU after update, causing mouse and keyboard input lag #38551
   • Windows Desktop regression: Codex uses 6+ GB RAM, ~235 MB/s disk and causes system-wide mouse lag after update #38506
   • [Windows][Desktop 26.810.4967.0] Opening or switching conversations can trigger a persistent 350-800 MiB/s read loop and system-wide stutter #38518

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4. sanrandry commented on Aug 14, 2026

   

   sanrandry

   on Aug 14, 2026

   Last edited by sanrandry

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   same issue here,
   I’m switching to Claude Max.
   What the hell are the OpenAI devs doing?????

   😄React with 😄1Reacted by nukfulkchkbuk
5. kbauer commented on Aug 15, 2026

   

   kbauer

   on Aug 15, 2026

   Last edited by kbauer

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   I've been seeing the same issue. I have submitted it with feedback ID no-active-thread-01a004fc-8796-7711-b0ae-c6f6973ff875; I attach the report also as a markdown file. Relevant screenshots and a screen capture of the lag vanishing when switching to Task Manager I have included via https://imgur.com/a/J3QXIc1.

   no-active-thread-01a004fc-8796-7711-b0ae-c6f6973ff875.md
6. ramtamir26-ctrl commented on Aug 16, 2026

   

   ramtamir26-ctrl

   on Aug 16, 2026 – with ChatGPT Codex Connector

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   I can reproduce this on Windows with an RTX 5070 Laptop GPU, and I was able to narrow the trigger down further.

   Observed behavior:

   • Any Codex main workspace/chat view causes system-wide mouse stutter, including a completely blank/new chat.
   • Switching the same app to Settings makes the mouse smooth again.
   • Minimizing Codex immediately makes the mouse smooth.
   • More importantly, leaving Codex open but completely covering the Codex window with another window also makes the mouse smooth; exposing the Codex workspace again immediately brings the stutter back.
   • Maximized vs restored/non-maximized makes no difference: the problem occurs whenever the workspace is actually visible.
   • Disabling the semi-transparent sidebar did not help.
   • Task Manager shows repeatable GPU activity/spikes when the Codex workspace is visible (roughly up to ~16% total GPU in my test), while Codex CPU usage is only around 2–4%.

   This strongly suggests that, at least on my machine, the trigger is the visible Codex workspace rendering/compositing path, rather than an active agent task, conversation length, or general CPU saturation. The fact that mere window occlusion eliminates the stutter seems especially diagnostic because Codex remains open and running.

   This looks closely related to #38710 (GPU/DWM load), but the occlusion test may help isolate the rendering/compositor side of the regression.