As soon as I pair a Bluetooth headset or mouse, a process sits at 30 percent CPU and stays there after pairing.
A stale Bluetooth stack or conflicting driver can loop on scanning after every pair. Rebuilding the stack usually fixes it without hardware replacement.
Try this first
- 1Open Device Manager (devmgmt.msc), expand 'Bluetooth'. Remove all paired devices and the adapter itself (right-click, Uninstall device, tick 'Delete the driver software').
- 2Reboot. Windows reinstalls the Bluetooth driver from Windows Update. On Lenovo or Dell prefer the OEM version from the support page.
- 3Pair one device again and monitor with Process Explorer (Sysinternals) which process now eats CPU. 'BluetoothUserService' or a vendor tool like 'BTTray.exe' often shows up.
- 4If the OEM tool is the culprit and you don't need it (Microsoft's own stack is enough in 95 percent of cases): uninstall it via Apps & Features.
- 5Update adapter firmware via Lenovo Vantage, Dell Command Update or HP Image Assistant. Bluetooth firmware fixes ship under 'Wireless LAN/Bluetooth update'.
- 6For Mac: System Settings, Bluetooth, 'Forget Device' on each pair, then terminal 'sudo pkill bluetoothd' to restart the daemon.
When to bring us in
If high CPU returns without pairing anything, the Bluetooth radio itself is faulty or the driver bundle doesn't match your adapter revision. Ask the hardware vendor for a driver specific to your hardware ID.
See also
- My laptop is suddenly slowThree main suspects: a runaway background process, near-full disk, or a Windows update in progress.
- One specific application is slow for everyoneIf an app is slow for one person: local. For everyone at once: server side or vendor side.
- Opening files from the file server takes minutesOften the server itself is fine and the issue is network routing or stalling DNS resolution.
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