[offyotto]

Why

CoreMonTouchBarController.makeSnapshot() runs on the main thread:

• on every 10 s refresh;
• once per widget in configure(_:) whenever the bar is rebuilt. startAppTouchBar() runs when Core-Monitor becomes active and again shortly after any other app is activated, so app switching triggers it too.

Each snapshot made two system calls on the main thread:

• storageUsagePercent() called URL.resourceValues for the home volume's capacity. SystemMonitor already samples the same figure off the main thread as diskStats.usagePercent, using the same formula: used = total − available for important usage.
• currentWiFiName() called CWWiFiClient.shared().interface()?.ssid(). Nothing reads TouchBarSystemSnapshot.wifiName.

Change

• ssdPct now comes from systemMonitor.diskStats.usagePercent.
• The unused wifiName field, currentWiFiName(), storageUsagePercent() and the controller's import CoreWLAN are removed.
• The Wi-Fi status widget (SWifiItem) has its own CWWiFiClient and is unchanged.

The SSD bar now follows SystemMonitor's disk cache rather than reading the volume live. Because it refreshes every 10 s anyway, the value should look the same.

Verified

• xcodebuild test -scheme Core-Monitor -destination 'platform=macOS' CODE_SIGNING_ALLOWED=NO passes locally on Xcode 27.0: TEST SUCCEEDED, 0 failures.

Not done: I did not check this on Touch Bar hardware.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-02T14:11:32.553522Z	55b4e14	PR opened

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[gitar-bot]

Code Review ✅ Approved

🟡 Medium risk · Using cached disk usage may make the Touch Bar’s SSD value stale; the excluded GroupViews.swift deletion has unclear impact.

Moves the Touch Bar snapshot's SSD usage to the cached SystemMonitor disk stats and removes the unused Wi-Fi name lookup, so makeSnapshot() no longer does I/O on the main thread. No issues found.

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