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Disk Usage 100% Causing System Lag

Marcus Owen 0 Reputation points
2026-04-30T11:56:58.8266667+00:00

For the past 2-3 weeks I have been experiencing intermittent lag, and noticed that my disk usage is often spiking to 100% causing the lag. This can last from 2-20 seconds. My PC is less than 2 years old.

I have run a disk check, performed a health scan and health check and have disabled Sysmain. I have also disabled unnecessary apps on startup and uninstalled bloatware. I have 1x 1TB SSD Twinmos.

The process causing the most disk usage in task manager is 'System', 'Vivaldi', and 'Registry'. Sometimes some Service Host processes.

I am currently performing a full system scan with Windows Security to see if I have any viruses. Whilst running the full scan Antimalware Service Executable appears to be hogging 100% of disk space for virtually the entire time.

Is it worth performing a system restore point for say 4 weeks ago to see if this improves performance?

Any advice would be very much appreciated

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Windows for home | Windows 11 | Performance and system failures
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  1. DaveM121 878.2K Reputation points Independent Advisor
    2026-04-30T12:33:00.8766667+00:00

    Then running the scan it is normal for Antimalware Service Executable to be using almost all the disk access.

    When that scan completes, if that indicates no malware is found on your system, go to the support page for your Motherboard on the manufacturers website, then from there, download and install the version of Chipset drivers they recommend and while there, if you do not have your drive encrypted with Bitlocker, check for any BIOS update that may need to be installed

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