[Windows] Mouse becomes severely laggy while Codex is thinking

Title:
[Windows] Mouse becomes severely laggy while Codex is thinking

Description:
The Codex desktop app causes severe mouse input lag while it is in the thinking state. The cursor feels delayed and floaty. The issue happens consistently during thinking and improves after the response finishes.

Reproduction steps:

1. Open the Codex desktop app.
2. Send a request that keeps Codex in the thinking state for several seconds.
3. Move the mouse while Codex is thinking.
4. Observe severe cursor delay and stuttering.
5. After the response finishes, mouse responsiveness improves.

Expected behavior:
Codex should not affect system-wide mouse responsiveness while generating a response.

Actual behavior:
Mouse movement becomes delayed and feels floaty whenever Codex is thinking.

Environment:

• Windows desktop
• Codex version: 26.814.5167.0 x64
• NVIDIA GeForce RTX 2060
• Intel UHD Graphics 630
• NVIDIA driver: 32.0.15.9144
• Intel driver: 27.20.100.8729
• Oray virtual display driver is installed

Diagnostics:

• Overall CPU usage did not reach 100%; observed peak was about 35%.
• Memory usage was about 57%.
• DPC time stayed around 1% or lower.
• Codex renderer memory reached approximately 400 MB.
• Codex GPU process used approximately 10% to 19% GPU.
• The issue is not resolved by restarting Codex, closing other applications, exiting remote-control software, lowering the Codex GPU process priority, or launching with --disable-gpu.

Additional information:
GPU forcing between RTX and Intel has not yet been tested. Session ID from the in-product feedback submission:
Codex task/thread ID: 01a018d3-76fc-7342-bce4-8c2b840ce918
Feedback session ID: Not available

Start by reproducing the lag on Windows using the listed Codex version and hardware while a request remains in the thinking state. Profile the desktop app during reproduction, then verify that mouse responsiveness remains normal while Codex generates a response.