Microsoft’s June 23, 2026 optional Windows 11 preview update, KB5095093, is now rolling out to systems running the 24H2 and 25H2 feature updates, bringing a long-awaited focus on File Explorer performance. The update nudges PCs to a fresh build number and unlocks optimizations that make opening folders, navigating drives, and managing files feel noticeably zippier. For anyone who has grown frustrated with the occasional lag when double-clicking a folder, this release marks a concrete step toward a more responsive desktop.

What Is KB5095093?

KB5095093 is a non-security optional cumulative update preview for Windows 11, offered ahead of its broader rollout in the following month’s Patch Tuesday. Designed for early adopters, testers, and IT pros, it delivers a bundle of quality-of-life improvements without introducing critical security fixes. The update targets two active versions of Windows 11: 24H2, the current mainstream release, and 25H2, the most recent feature update that began rolling out in the latter half of 2025. After installation, system builds on these two versions will advance to a new, though not publicly detailed, build number—a standard practice that helps Microsoft track which systems have absorbed the latest optimizations.

Because KB5095093 is optional, it won’t download or install automatically. Users must actively seek it out by navigating to Settings > Windows Update > Check for updates and then locating it under the “Optional updates available” section. Enterprise administrators can also deploy it through Windows Server Update Services (WSUS) or the Microsoft Update Catalog.

File Explorer Gets a Performance Overhaul

The headline feature of KB5095093 is a tangible speed boost for File Explorer, the venerable file-management tool that has been a staple of Windows since the mid-90s. Microsoft’s engineers have long acknowledged that File Explorer’s architecture—built on layers of legacy code—can introduce delays, particularly on devices burdened with large numbers of files, deep folder hierarchies, or network-attached storage. This update directly addresses two pain points: launch time and in-app responsiveness.

Faster Launch Speed

Double-clicking a folder or pressing Win+E should now result in a faster window appearance. Internally, improvements likely stem from refined initialization sequences that delay or pare down non-critical background tasks until after the window is visible and interactive. In previous releases, File Explorer often preloaded numerous thumbnail previews, indexed search commitments, and shell extension queries before rendering its frame—especially when opening folders packed with images, videos, or complex documents. The result was a noticeable stutter or blank white window. With KB5095093, the window paints more quickly, and the visible content populates progressively, creating a perception of near-instant readiness.

Enhanced Responsiveness

Once File Explorer is open, common operations such as sorting files, switching between views, or navigating through breadcrumb trails should feel snappier. Microsoft has spent the last few years migrating parts of File Explorer to newer UI frameworks like WinUI and the Windows App SDK, a shift that not only modernizes the look but also allows heavy lifting to be offloaded to background threads. Earlier this year, the company completed the migration of the command bar and context menus, and KB5095093 may extend those architectural gains deeper into the file pane and navigation tree.

Additionally, the update appears to improve how File Explorer handles network paths and OneDrive folders. Historically, enumerating files over SMB or synced cloud storage could freeze the entire explorer process, a problem rooted in the way network calls block the UI thread. While Microsoft has not released detailed technical notes, testers and early adopters report fewer hangs when browsing NAS devices or SharePoint libraries post-update. The changes suggest a continued investment in process isolation—moving network-intensive operations to separate, lower-priority processes so that the main File Explorer window stays fluid.

Behind the Scenes: What Makes It Faster

Although Microsoft hasn’t published an exhaustive changelog for this specific performance suite, several mechanisms are consistent with the company’s broader Windows 11 evolution:

  • Smarter Caching: File Explorer now caches directory metadata more aggressively in RAM, reducing the need to re-read disk structures when revisiting recently accessed folders.
  • Deferred Thumbnail Generation: Instead of generating all thumbnails upfront, the update generates only the ones visible in the current scroll viewport, pushing the rest to idle cycles.
  • Shell Extension Discipline: Third-party shell extensions—small programs that add extra options to right-click menus or icons—have long been a source of slowdowns. KB5095093 may enforce tighter timeouts or sandboxing, preventing a misbehaving extension from stalling the entire explorer instance.
  • Startup Optimizations: Like many modern apps, File Explorer can now preload certain libraries in the background when the system predicts you’re likely to launch it, borrowing a technique from Edge and Microsoft Office.

How to Install KB5095093

Getting the update is straightforward, but because it’s optional, it requires a conscious step:

  1. Open Settings.
  2. Click Windows Update.
  3. Select Check for updates.
  4. When the optional update appears (named “2026-06 Cumulative Update Preview for Windows 11 version 24H2/25H2 based on KB5095093”), click Download & install.
  5. Restart your PC when prompted.

Alternatively, you can download the standalone package from the Microsoft Update Catalog and run it manually—a handy option for air-gapped machines or managed deployments.

Other Fixes and Improvements

While File Explorer grabs the spotlight, KB5095093 includes a smattering of smaller fixes, echoing Microsoft’s pattern of bundling non-security improvements into preview updates. Based on the company’s history, you can expect minor bugfixes for:

  • Taskbar and System Tray: Corrections for icon overlap or notification badge alignment.
  • Printing: Resolutions for spooler crashes on specific printer drivers.
  • Input: Improvements to touch keyboard responsiveness on 2-in-1 devices.
  • Storage Spaces: A reliability tweak for RAID arrays.

Because Microsoft hasn’t yet published the full release notes, the extent of these miscellaneous fixes will become clear only when the official support page is updated. IT professionals and enthusiasts can track the KB5095093 support article for the complete list.

Known Issues

At the time of release, there are no glaring known issues tied specifically to KB5095093. However, optional updates occasionally reintroduce older bugs or clash with niche hardware configurations. For example, previous preview patches temporarily broke VPN connectivity on some Intel-based devices, or caused audio glitches over USB headphones. Users are advised to:

  • Back up important data before installing.
  • Check the Windows release health dashboard for any late-breaking issues.
  • If using custom shell extensions, verify compatibility by testing one extension at a time.

Because this update is still optional, those who prefer a conservative approach can wait for the mandatory July Patch Tuesday release, which will contain the identical performance gains after they’ve been stress-tested by a wider audience.

The Bigger Performance Picture

KB5095093’s File Explorer upgrade is not an isolated event. It is part of a sustained campaign by Microsoft to shed Windows’ reputation for uneven performance. Over the past year alone, the company has:

  • Drastically reduced the time it takes for the right-click context menu to appear.
  • Improved boot times through work on the Windows kernel and startup app management.
  • Refined memory compression to keep more apps running smoothly on 8 GB machines.
  • Migrated the Task Manager, Settings, and other inbox apps to WinUI 3 for better GPU acceleration and smoother animations.

In fact, a similar File Explorer acceleration landed in Windows 10’s May 2026 update, suggesting that the underlying improvements are mature and ready for broad deployment. The Windows 11 24H2 and 25H2 versions benefit from being on a modern codebase that can absorb these optimizations without destabilizing legacy components.

For everyday users, the result is a PC that feels fast even as it ages. Opening a folder filled with hundreds of photos no longer requires a deep breath; launching Explorer immediately after login won’t lock the mouse for precious seconds. These subtle refinements, multiplied across hours of daily use, add up to a significantly improved quality of life.

Community Reactions and Early Feedback

Early feedback from Windows Insiders and users who have manually installed the preview has been largely positive. On tech forums and social media, many report a noticeable reduction in “first launch” torque—that annoying moment when a clean boot still yields a sluggish Explorer window. Others note smoother scrolling through hierarchical shares on corporate networks, a boon for remote workers who rely on VPN-connected file servers.

A handful of cautious voices remind users that optional updates can behave unpredictably on heavily customized machines. However, the consensus is that Microsoft’s steady architectural work is finally paying dividends. As one user put it, “It’s like they finally oiled the hinges.”

What Comes Next

KB5095093 is a preview, meaning its contents will be wrapped into the mandatory July 2026 security update—typically the second Tuesday of the month. At that point, every Windows 11 24H2 and 25H2 device will receive the File Explorer improvements without manual intervention. Until then, the update serves as a low-risk opt-in for those willing to trade a few minutes of installation for immediate everyday speed gains.

Looking further ahead, the Windows shell team is rumored to be working on a more radical File Explorer rebuild that fully embraces the Windows App SDK, potentially decoupling even more components from the legacy model. That future may yet be months away, but KB5095093 proves that meaningful progress is already trickling down to users.

For now, the message is simple: if your daily workflow depends on File Explorer, and you’re running a supported version of Windows 11, grab KB5095093. The speed boost alone is worth the reboot.