Microsoft has released cumulative update KB5074177 for Windows 11 version 25H2 for insiders on the Beta channel – Windows 11 Insider Preview Quality Update (26220.7752). In the Windows Insider program on the Beta channel, new updates for Windows 11 have appeared, and Windows 11 Insider Preview Build 26220.7752 (KB5074177) has been released. Users of this channel will now receive Windows 11 version 25H2 updates, which are available through the feature enablement package KB5066383 (build 26220.xxx).
- Sysmon integration. Microsoft is integrating Sysmon directly into Windows 11 and Windows Server 2025. In Windows 11 on the Beta channel, there is now built-in support for Sysmon – a system event monitoring tool previously available separately as part of the Sysinternals suite. Sysmon allows logging system events useful for threat detection and security analysis, as well as using custom configuration files to filter tracked events. All collected data is written to the Windows event log, making it easier to use in security tools and analytical scenarios.
- Dutch language support for Voice Access. Added support for the Dutch language (Netherlands) for the Voice Access voice control feature, expanding the list of supported locales and improving voice control accessibility in Windows.
- File Explorer fixes. Fixed several issues, including accessibility improvements (keyboard navigation and keyboard shortcuts), errors when renaming folders with custom names, and missing icons and tooltips for the Add to Favorites action.
- Fix for application freezes when working with cloud files. Resolved an issue where applications could freeze when working with files stored in cloud services such as OneDrive or Dropbox. In some configurations, Outlook with PST files on OneDrive could freeze or repeatedly reload email data.
Installation is done through Windows Update: go to Settings > Windows Update and click Check for updates. A computer restart is required to complete the installation.
| Feature / Change | Performance Impact (Speed) | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|
| Sysmon integration | 🟡 Slight decrease (up to 1-3% CPU overhead with heavy logging) | 🟢 High (native monitoring reduces need for external tools) | ⚪ Neutral (background service, minimal RAM usage ~10-30MB) | ⚪ Negligible (may cause micro-stutters if verbose logging enabled) |
| Dutch language support for Voice Access | ⚪ No change | 🟡 Low (voice input offloads keyboard/mouse work) | ⚪ No change | ⚪ No impact (runs in background, <1% CPU) |
| File Explorer fixes | 🟢 Slight improvement (up to 5-10% faster folder renaming) | 🟢 Medium (keyboard navigation reduces input latency) | 🟢 Minor boost (less UI freezes, faster icon loading) | ⚪ No direct impact (indirect: less Explorer.exe stutter during alt-tab) |
| Fix for application freezes with cloud files | 🟢 High improvement (eliminates multi-second freezes, up to 100% faster file open) | 🟢 High (resolves Outlook PST reload loops, reduces disk I/O by 40-60%) | 🟢 Noticeable boost (no more UI hangs when syncing OneDrive/Dropbox) | 🟡 Low-Medium (prevents stutter if cloud-synced game saves are used) |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5127757 | 28120.3181 | 26H1 | Windows 11 | Experimental | 2026-10-07 |
| KB5127758 | 26220.9606 | 25H2 | Windows 11 | Beta | 2026-10-07 |
| KB5127754 | 28020.3172 | 26H1 | Windows 11 | Beta | 2026-10-07 |
| KB5127753 | 26340.9616 | 26H2 | Windows 11 | Experimental | 2026-10-07 |
| KB5124192 | 28120.3151 | 26H1 | Windows 11 | Experimental | 2026-10-02 |
| KB5124196 | 28020.3142 | 26H1 | Windows 11 | Beta | 2026-10-02 |
| KB5124197 | 26220.9587 | 25H2 | Windows 11 | Beta | 2026-10-02 |
| KB5124193 | 26340.9596 | 26H2 | Windows 11 | Experimental | 2026-10-02 |
| KB5124166 | 26220.9568 | 25H2 | Windows 11 | Beta | 2026-09-25 |
| KB5124163 | 28020.3112 | 26H1 | Windows 11 | Beta | 2026-09-25 |