Microsoft has admitted that two widely used features in Windows 10 and Windows 11 are slowing down computers, with OneDrive file synchronisation and visual effects identified as the main causes.
The company has also shared advice for users and pledged improvements in future updates.
The disclosure follows Microsoft’s claim that Windows 11 version 25H2, its latest update, delivers far better performance than versions 24H2 and 22H2, particularly in speed and responsiveness. However, the company acknowledged that certain built-in features can counteract these improvements.
The first culprit is OneDrive sync. Microsoft described OneDrive as an essential tool that allows users to access files across devices and provides cloud backup in case of hardware failure. But the process of real-time syncing consumes significant system resources, especially when large folders such as Documents, Desktop or Pictures are uploaded or downloaded. This can cause noticeable slowdowns at peak times.
To mitigate the issue, Microsoft recommends that users pause OneDrive synchronisation temporarily if their PC feels sluggish. The company stressed that doing so will not affect existing files, and syncing can be resumed at any time. Microsoft added that the new OneDrive app for Windows 11 may optimise resource usage in future updates, reducing the problem.
The second feature slowing systems is Windows 11’s visual effects, including animations and shadows, that enhance the look of the interface. Microsoft explained that these consume additional CPU, GPU and RAM resources. Devices with limited specifications, particularly those with less than 8GB of RAM, are most affected, resulting in lag or delays when multiple applications are opened simultaneously.
Turning off the effects can be done through the Performance Options menu. Users can search ‘performance’ in Windows, select ‘Adjust the appearance and performance of Windows’, and then choose ‘Adjust for best performance’ before applying the changes.
Disabling the effects simplifies the interface but makes systems more responsive, especially on entry-level laptops and PCs.
Microsoft confirmed that OneDrive sync and visual effects are the two main factors slowing down Windows systems. Small adjustments, such as pausing sync or disabling animations, can noticeably boost performance in both Windows 11 and Windows 10, without the need to install additional software.