Microsoft has released Windows 11 Insider Preview Build 26220.7653 (KB5074157) to the Beta channel, marking a significant step toward the anticipated 25H2 release. This targeted preview quality update introduces three major user-facing features: a modernized WinUI 3-based accounts page in Settings, an 'Instant Copilot' capability for faster AI assistant access, and native support for WebP images as desktop wallpapers. These changes represent Microsoft's continued refinement of the Windows 11 user experience, blending visual modernization with practical performance improvements and expanded format support.

A Modernized Settings Experience with WinUI 3

The most visually apparent change in Build 26220.7653 is the complete overhaul of the Accounts page within the Settings app. Microsoft has rebuilt this critical system management interface using the modern WinUI 3 framework, replacing the legacy implementation. This transition delivers several immediate benefits to users and represents a strategic shift in Microsoft's development approach.

Visually, the new accounts page features updated styling and animations that align with the Fluent Design language prevalent throughout Windows 11. The interface appears cleaner, with better spacing and more consistent iconography. More importantly, the WinUI 3 foundation brings performance improvements to page loading and navigation within the accounts section. Users managing multiple accounts, whether Microsoft accounts, work/school accounts, or family accounts, should notice smoother transitions and more responsive controls.

This update continues Microsoft's multi-year effort to modernize the Windows shell and system applications. The Settings app has been gradually transitioning from its original hybrid implementation toward a fully modern codebase. The accounts page overhaul follows similar updates to other Settings sections, creating a more unified and maintainable codebase for Microsoft's developers. For end-users, this translates to fewer inconsistencies and a more predictable experience when navigating system configurations.

Instant Copilot: Reducing AI Assistant Latency

Perhaps the most practically significant addition in this build is what the community has dubbed 'Instant Copilot'—a feature designed to dramatically reduce the launch time of Microsoft's AI assistant. Previously, invoking Copilot (typically via the Win+C keyboard shortcut or taskbar button) involved a noticeable delay as the sidebar interface loaded and initialized. With Build 26220.7653, Microsoft has implemented preloading optimizations that make Copilot available almost immediately upon invocation.

Technical analysis suggests Microsoft is employing background initialization techniques that prepare Copilot's interface and services before the user explicitly requests it. This approach mirrors strategies used in web browsers and other applications to reduce perceived latency. The implementation appears to balance resource usage against responsiveness, with the system intelligently determining when to prepare Copilot based on user patterns and available system resources.

For daily Copilot users, this change represents a substantial quality-of-life improvement. The reduced friction makes the AI assistant feel more integrated into the workflow rather than a separate application that needs to be launched. This aligns with Microsoft's broader vision of making AI assistance ubiquitous and immediately accessible throughout the Windows experience. The 'Instant Copilot' feature may also hint at future optimizations for other system components, suggesting Microsoft is prioritizing responsiveness across the operating system.

Native WebP Wallpaper Support

The third headline feature in this build is native support for WebP images as desktop wallpapers. Previously, while Windows 11 could display WebP images in certain applications like the Photos app and Microsoft Edge, the operating system's wallpaper engine only supported traditional formats like JPEG, PNG, and BMP. This limitation forced users to convert WebP images to other formats or use third-party tools to set them as wallpapers.

WebP (Web Picture format), developed by Google, offers superior compression efficiency compared to JPEG and PNG while maintaining quality. WebP images can be 25-35% smaller than equivalent JPEGs, reducing storage requirements and improving loading times. The format also supports transparency (like PNG) and animation capabilities, though the wallpaper implementation in Windows 11 currently supports only static WebP images.

This addition reflects Microsoft's acknowledgment of evolving web standards and user behaviors. As more images on the internet are shared in WebP format—particularly from platforms like Google Photos, social media sites, and modern web applications—users increasingly encounter this format in their daily digital lives. By adding native wallpaper support, Microsoft eliminates a friction point for users who want to personalize their desktops with images sourced from the modern web.

Under-the-Hood Improvements and Fixes

Beyond the three headline features, Build 26220.7653 includes numerous quality improvements and bug fixes that address issues reported by Insiders in previous builds. While Microsoft's official release notes highlight the major features, community testing reveals several noteworthy refinements:

  • Improved memory management for certain system processes, particularly noticeable on devices with 8GB RAM or less
  • Refinements to the updated volume mixer introduced in recent builds, with smoother animations and better application grouping
  • Fixes for explorer.exe crashes that some users experienced when navigating certain folder structures
  • Adjustments to Widgets board behavior, particularly regarding news feed loading and refresh mechanisms

These incremental improvements demonstrate Microsoft's commitment to polish and stability even in preview builds targeted at the Beta channel. The company appears to be balancing the introduction of new features with necessary refinements to existing components, suggesting this build represents a maturation point in the 25H2 development cycle.

The 25H2 Development Track

Build 26220.7653 is explicitly identified as a 25H2-track Preview Quality Update, placing it within the development timeline for the next major Windows 11 feature update expected in the second half of 2025. This designation is significant for several reasons:

First, it confirms that Microsoft is actively developing the next annual update while continuing to service the current 23H2 and 24H2 releases. The company's parallel development approach allows for longer testing cycles for major updates while maintaining regular quality updates for existing releases.

Second, the features introduced in this build—particularly the WinUI 3 accounts page and Instant Copilot—likely represent core components of the 25H2 release. While additional features will certainly be added before the final release, these elements appear sufficiently polished for Beta channel testing, suggesting they're on track for inclusion in the final product.

Third, the WebP wallpaper support, while seemingly minor, may indicate broader format support improvements planned for 25H2. Microsoft has been gradually expanding Windows' support for modern file formats, including better AVIF integration and improved handling of various media containers. This trend toward format-agnostic system components reflects the evolving digital ecosystem where proprietary formats are giving way to open, efficient standards.

Community Reception and Testing Considerations

Early feedback from Windows Insiders testing Build 26220.7653 has been generally positive but measured. The WinUI 3 accounts page receives praise for its visual polish and responsiveness, with testers noting the improved consistency with other Settings sections. Some users have reported minor rendering issues on high-DPI displays, but these appear to be edge cases rather than widespread problems.

The Instant Copilot feature has generated the most enthusiastic response, with testers confirming the noticeably faster activation times. Some power users have expressed concerns about potential resource usage from background initialization, particularly on systems with limited RAM. Initial monitoring suggests the impact is minimal, but this will require longer-term observation across diverse hardware configurations.

WebP wallpaper support has been welcomed as a long-overdue quality-of-life improvement. Users who frequently download images from the web appreciate the elimination of conversion steps. Some testers have noted that animated WebP files still cannot be set as wallpapers, suggesting this might be a future enhancement opportunity.

As with any Beta channel build, users should approach installation with appropriate caution. While more stable than Dev channel builds, Beta releases can still contain bugs that affect specific hardware configurations or software combinations. Microsoft recommends that Insiders ensure they have recent backups before installing preview builds and be prepared to report any issues through the Feedback Hub.

Looking Ahead: The Future of Windows 11 Development

Build 26220.7653 offers intriguing clues about Microsoft's direction for Windows 11 throughout 2025. The continued modernization of system components with WinUI 3 suggests we'll see more Settings pages and system dialogs updated to the modern framework. This architectural shift not only improves visual consistency but also enables faster iteration and feature delivery.

The Instant Copilot optimizations point toward Microsoft's increased focus on AI integration performance. As Copilot gains more capabilities and deeper system integration, ensuring minimal latency becomes crucial for user adoption. We may see similar optimizations for other AI-powered features in future builds.

The addition of WebP wallpaper support, while seemingly minor, reflects Microsoft's attention to real-world user workflows. By removing friction points like format conversion, Microsoft makes personalization more accessible. This user-centric approach may extend to other areas where Windows traditionally lagged behind web standards.

For Windows enthusiasts and IT professionals, Build 26220.7653 represents a promising glimpse at the 25H2 update's direction. The balance of visual modernization, performance optimization, and format support expansion suggests a release focused on refinement rather than radical change—a sensible approach for an operating system now in its fourth year of availability.

As always with Insider previews, features may change, be removed, or fail to reach general availability. However, the solid implementation of these three features in a Beta channel build suggests they have strong prospects for inclusion in the final 25H2 release. Windows users can look forward to a more responsive, visually consistent, and format-friendly experience as Microsoft continues refining its flagship operating system.