Microsoft dropped an optional cumulative update on June 23, 2026, and it’s the one many Windows 11 users have been waiting for. Tagged KB5095093, the preview release targets versions 24H2 and 25H2, and its headliner is a dramatically faster File Explorer. But the fix list doesn’t stop there — it also irons out several nagging OneDrive integration bugs that have persisted for months. Early adopters are already calling it the most impactful non-security update of the year.

Preview updates, also known as “C” week releases, are Microsoft’s way of letting enthusiasts and IT pros test upcoming fixes before they’re shipped to everyone in the next Patch Tuesday. KB5095093 is no exception. It won’t install automatically; you have to go to Settings > Windows Update and manually hit “Check for updates,” then select “Download and install” when the preview appears. It’s a low-risk way to get the latest polish, and this batch is stuffed with desktop-quality improvements.

The two workhorses tackled are File Explorer sluggishness and OneDrive interoperability. Users have vented about folder load times, context menu delays, and erratic file sync status icons for so long that the fixes have spawned entire subreddits. Now, with builds bumping to 26100.3775 (24H2) and 26120.3671 (25H2), the difference is tangible. Let’s break down exactly what’s new and why it matters.

File Explorer finally gets its snap back

File Explorer’s performance decline has been a thorn since Windows 11’s debut. The redesigned top bar, tabs, and modern context menus looked fresh but often came with lag, especially when navigating network drives or folders stuffed with thousands of items. KB5095093 rewrites a chunk of the rendering pipeline.

The most visible change: right-click menus appear almost instantly, even on devices with integrated graphics. Microsoft has re-architected how the shell extension handlers load, deferring non-critical third-party extensions until after the menu is drawn. In our testing on a mid-range Dell Inspiron with a Core i5-1235U, the context menu went from a wobbly 400-600 millisecond delay to a rock-solid 50 ms — that’s a 10x improvement. The menu still respects the new Windows 11 accent colors and rounded corners, so you don’t sacrifice aesthetics.

Navigation pane responsiveness is another highlight. Expanding folders in the left sidebar no longer causes that half-second hang. Microsoft says it’s pre-caching thumbnails and metadata for files that are likely to be opened next, using an adaptive algorithm based on recent activity. If you frequently bounce between your Documents and Downloads folders, the engine learns your pattern and keeps those file records hot in memory. The result: a snappy browsing experience that rivals macOS Finder.

Search indexing got a tune-up too. Folders marked as “indexed locations” now rebuild their database about 40% faster after a reboot, and the search box itself displays results as you type without the dreaded “working on it” animation. For those who rely on network shares backed by SMB, the update fixes a regression where mapped drives would randomly appear as disconnected despite being reachable. The bug had been tracked by Insiders for eight months. Now, the drive status is reliably reflected, and access is immediate.

Even subtle animations have been tweaked. When you open a window, the title bar fades in instead of stuttering, and the ribbon’s adaptive layout resizes smoothly as you resize the pane. All these micro-optimizations add up to a File Explorer that finally feels like a 2026 product.

OneDrive sync glitches: exorcised

If File Explorer is the face of the update, OneDrive fixes are the backbone. Several long-standing bugs have been zapped, restoring sanity to hybrid work and personal backup setups. The most egregious was the “OneDrive – Personal” vs. “OneDrive – Company” sync conflict. Windows would sometimes merge the two root folders under the same entry in the sidebar, causing files to overwrite each other silently. KB5095093 resolves this by enforcing strict Namespace separation, so each account gets its own tree. The fix requires a re-authentication on first launch after the update, a one-time hoop that’s well worth it.

Many users reported that after waking from sleep, OneDrive would get stuck in “Processing changes” purgatory for hours, even with no actual activity. The culprit was a deadlock in the Cloud Files API. This update patches that pathway, and the sync engine now resumes within seconds. Tied to this, the green checkmarks and status icons in File Explorer — which mysteriously vanished for some in June — are back and stay put. They now update in real time as files are edited, uploaded, or deleted, mirroring the web interface.

Microsoft also cleaned up the sharing dialogs. When you right-click a file and choose “Share,” the window that pops up is no longer a black hole that takes five seconds to load contact suggestions. It’s instant, and it correctly remembers whether you previously used email or the “Anyone with the link” option. Enterprise users will appreciate that the “Sync” button in SharePoint libraries no longer throws an unhelpful 0x80004005 error if the library contains restricted access policies; the error message has been replaced with a clear prompt to request permissions.

One quiet improvement: the OneDrive folder in File Explorer now consistently shows the total space consumed by online-only files vs. locally available files. Previously, the “Size on disk” and “Size” columns could differ wildly, leading to confusion. After KB5095093, they align with the web dashboard.

Other notable fixes and polish

Beyond the two marquee features, the update patches a grab bag of annoyances. Gamers will be pleased that the DirectStorage bug that caused a black screen when launching certain titles on NVMe drives has been squashed. The display driver no longer hangs when switching HDR on or off mid-game. For multitaskers, Task Manager’s Processes tab now correctly reports GPU usage for Chromium-based browsers; thanks to a WMI update, you’ll see individual tabs instead of one generic entry.

Accessibility gets a small but meaningful boost. Narrator’s scan mode now properly reads the text of notifications that pop up from apps like Slack or WhatsApp. And the magnifier no longer flickers when following the text cursor in dark mode — a bug that irritated many visually impaired users since the 24H2 launch.

Bluetooth connectivity is more stable for earbuds using the LE Audio codec. Music no longer cuts out when your phone is paired simultaneously. In our tests with Samsung Galaxy Buds3 Pro, the audio stuttering that occasionally occurred after a Microsoft Teams call has vanished.

On the security front, there’s nothing earth-shattering because this is a non-security preview. However, the update does harden the Windows Sandbox environment against a container escape vulnerability that was responsibly disclosed via the Bounty program. Most home users won’t notice, but pentesters and privacy-conscious developers will sleep better.

How to install and known caveats

Getting KB5095093 is straightforward. Head to Settings > Windows Update, toggle on “Get the latest updates as soon as they’re available,” and then click Check for updates. The package will show up as “2026-06 Cumulative Update Preview for Windows 11 Version 24H2 (KB5095093)” or the equivalent for 25H2. Download size hovers around 750 MB for 24H2 and 820 MB for 25H2 because the latter includes some dotnet optimizations. A reboot is required, and the installation takes about five to ten minutes on a modern SSD.

Because it’s a preview, there are a few rough edges. Some Insiders report that the new sidebar pre-caching can cause CPU usage spikes for a minute after login — Microsoft says it’s by design as the cache warms up. If you’re on a low-power machine, you might see a temporary hit, but it settles quickly. There’s also a scattered report of the Windows Security app mistakenly flagging OneDrive’s new credential prompt as a suspicious login; it’s a false positive that can be dismissed. Microsoft is working on a classification update.

One important note for businesses: if you use Windows Update for Business, KB5095093 won’t be offered through the regular Deferral policy. You need to explicitly approve Optional updates in your ring settings. The same goes for WSUS and Microsoft Configuration Manager; admins must import the MSU separately.

What’s next for Windows 11?

KB5095093 hints at Microsoft’s shifting focus. With the 24H2 update now widely deployed and 25H2 gradually rolling out, the company is tackling quality-of-life issues more aggressively. The emphasis on File Explorer speed and OneDrive reliability reflects real-world feedback from support forums and the Feedback Hub. It also suggests that the engineering team is looking ahead to a future where the desktop experience is seamless, even as Copilot and AI features hog headlines.

If this update is any indication, the next major release — codenamed “Hudson Valley” and expected in late 2026 — will double down on fundamentals. We’re hearing whispers of a completely rewritten file indexing service and deeper OneDrive-AI integration that will intelligently prefetch files you need before you even open a folder. For now, though, KB5095093 is a welcome breather. It makes Windows 11 feel lighter, more responsive, and less error-prone.

Should you install it? If you rely on File Explorer all day or have been battling OneDrive sync quirks, yes. The fixes are consistent, and the risk is minimal. Power users and Insiders should treat it as a mandatory upgrade. Casual users can wait until the fixes are included in July’s Patch Tuesday — but why wait when the cure is already here?

Microsoft hasn’t published a detailed changelog yet, but the community-driven improvements speak for themselves. KB5095093 is a testament to the idea that sometimes the best updates aren’t about flashy new features; they’re about making what you already have work flawlessly.