Unexpected disk write activity while Codex is running

What happened?

I noticed unexpectedly high disk write activity while Codex was running on macOS.

From the disk monitor screenshot:

• Overall disk write rate: about 58.9 MB/s
• Overall disk read rate: about 1.7 MB/s
• The process table shows Codex writing about 127 KB/s
• Another process name appears garbled/unreadable in the monitor and is writing about 33.6 MB/s

I am not sure whether the high write rate is caused directly by Codex or by a child/helper process related to Codex, but the activity appeared while using Codex and looked abnormal enough to report.

Expected behavior

Codex should not cause sustained or unexpected high disk writes during normal usage.

Environment

• Codex CLI: codex-cli 0.142.4
• OS: macOS 26.5.1 (25F80)
• Architecture: arm64

Screenshot details

I have a local screenshot of the disk monitor. Since this issue is being created via gh issue create, I am summarizing the visible values here instead of attaching the local image directly.

Additional notes

Please let me know if there are recommended diagnostics to collect, such as logs, process names, file paths being written, or a command to trace disk I/O for Codex/helper processes.