I'm troubleshooting a Windows 11 laptop that becomes extremely slow and sometimes freezes for one or two minutes, even with only a few browser tabs loading. It has 16 GB of RAM and a 1 TB Silicon Power SSD, so I wouldn't expect this level of slowdown. Malwarebytes found and quarantined one suspicious file, and I removed several gigabytes of temporary files with CCleaner. CrystalDiskInfo reports that the SSD is healthy, and I've already disabled unnecessary startup items and removed some bloatware. Task Manager often shows 100% disk usage, but no individual process appears to be using much—usually less than 1 MB/s. Antivirus services sometimes show activity around 15 MB/s. What else should I check?
3 Answers
Start with Task Manager’s Processes tab and sort by the Disk column while the slowdown is happening. The overall 100% figure measures the drive being fully occupied, not necessarily high throughput, so a drive can hit 100% while transferring only a small amount of data if it’s handling lots of slow random reads or retries. Pay attention to antivirus scans, Windows Search, SysMain, and the System process. Temporarily pausing third-party antivirus protection, or stopping SysMain and Windows Search briefly for testing, can help identify whether one of them is responsible. Don’t leave security software disabled permanently.
CrystalDiskInfo mainly reports SMART health data; it doesn’t guarantee that the SSD is performing correctly under load. Check the SSD’s firmware, make sure the drive has plenty of free space, and run Windows’ built-in Optimize Drives tool so TRIM can be issued. Also check Event Viewer for disk, storahci, or controller errors. If the drive is nearly full, regularly reporting errors, or has unusually poor benchmark results, back up the data and consider replacing it even if the health status says ‘Good’.
The antivirus activity is worth investigating, especially since Malwarebytes and another endpoint-security product appear to be installed. Running multiple real-time security products can cause them to scan each other’s files and create heavy disk latency. Check whether both are providing real-time protection, and use only one primary real-time antivirus after confirming the system is clean. If the freezes continue, test the laptop with a clean boot and check the SSD’s performance with a benchmark or the manufacturer’s diagnostic tool.
I’d avoid changing AHCI or MSI registry settings based only on a 100% disk reading. First check for actual controller errors and make a backup before changing storage drivers or BIOS settings.