How to Fix System Interrupts High CPU on Windows

What Causes This?

System Interrupts is a Windows process that shows the CPU time used handling hardware interrupts and deferred procedure calls. When it stays high, the usual cause is a hardware driver problem, a misbehaving device, outdated chipset or audio drivers, USB devices, or power management issues. In some cases, corrupted system files or BIOS/firmware problems can also make interrupt activity spike.

Common Symptoms

• CPU usage from System Interrupts stays unusually high in Task Manager
• Fans run louder than normal even when you are not doing much
• The PC feels slow, stutters, or lags during simple tasks
• Audio crackling, mouse lag, or delayed keyboard input
• Battery drains faster than usual on a laptop

How to Fix It Manually

1. Confirm that System Interrupts is the problem

   • Open Task Manager with Ctrl + Shift + Esc.
   • Click More details if needed.
   • On the Processes tab, look for System Interrupts and check its CPU usage.
   • If it regularly stays above a few percent while the PC is idle, continue with the steps below.

2. Restart your PC and disconnect external devices

   • Restart Windows normally.
   • After rebooting, unplug non-essential devices such as USB hubs, external drives, printers, webcams, and game controllers.
   • Check Task Manager again.
   • If CPU usage drops, reconnect devices one at a time until you find the one causing the issue.

3. Update or reinstall hardware drivers

   • Press Windows + X and select Device Manager.
   • Expand key categories like Sound, video and game controllers, Network adapters, Universal Serial Bus controllers, and System devices.
   • Right-click a device and choose Update driver > Search automatically for drivers.
   • If the issue started after a recent driver update, right-click the device, choose Properties > Driver tab > Roll Back Driver if available.
   • Focus first on audio, network, storage, chipset, and USB drivers, since these commonly trigger high interrupt usage.

4. Disable devices temporarily to find the culprit

   • In Device Manager, right-click one non-critical device at a time and choose Disable device.
   • After each change, wait 15-30 seconds and watch System Interrupts in Task Manager.
   • Do not disable essential devices like your display adapter, system drives, keyboard, or mouse unless you know exactly what you are doing.
   • If CPU usage drops after disabling a device, that driver or hardware is likely the cause.

5. Turn off audio enhancements

   • Press Windows + I to open Settings.
   • Go to System > Sound > select your output device.
   • Find Audio enhancements and set it to Off.
   • If you use third-party audio software, disable its effects as well. Audio drivers are a common source of interrupt spikes.

6. Check Windows for corruption

   • Press Windows, type cmd, then right-click Command Prompt and choose Run as administrator.
   • Run this command:

     sfc /scannow

   • After it finishes, run:

     DISM /Online /Cleanup-Image /RestoreHealth

   • Restart your PC and check CPU usage again.

7. Install Windows, BIOS, and chipset updates

   • Open Settings > Windows Update and install all available updates.
   • Then visit your PC or motherboard manufacturer’s support page and install the latest chipset, audio, network, and BIOS/firmware updates.
   • Firmware fixes can resolve hardware interrupt problems that Windows updates alone do not fix.

Fix It Automatically with Kudu

If you do not want to hunt through drivers, startup items, and background clutter manually, Kudu can help. It scans for common sources of unnecessary background strain, removes junk that slows Windows down, and helps your system run with less overhead while you troubleshoot deeper hardware issues. For many users, it is the fastest way to clean up the system and reduce the load that makes high CPU problems feel worse.

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