High GPU usage and system lag with long conversation context on macOS
Resolved 💬 3 comments Opened Feb 7, 2026 by Eric-Terminal Closed Feb 7, 2026
What version of the Codex App are you using (From “About Codex” dialog)?
260206.1448 (565)
What subscription do you have?
Team
What issue are you seeing?
When the conversation context gets long, the GPU usage spikes to 100%. This causes the entire system to lag, and the MacBook Air gets very hot. The UI response becomes very slow.
What steps can reproduce the bug?
Start a new conversation
Keep chatting until the context is very long (e.g., after 50+ messages).
Observe the GPU usage in Activity Monitor or Stats.
What is the expected behavior?
The App should maintain low GPU usage regardless of context length, and the UI should remain smooth.
Additional information
Device: MacBook Air M1(2020), RAM: 8GB
macOS version: 26.2
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