Microsoft has confirmed that the WinUI framework powering many Windows 11 native apps uses more RAM than it should, and the company is prioritizing memory and performance fixes ahead of a long-planned Start menu rewrite. At Build 2026, the Windows UI team revealed internal testing of memory-use reductions, a switch to the system compositor, and a renewed focus on fundamentals — all to make Windows 11 feel faster, especially on entry-level PCs.

A Confession and a Plan

Chris Anderson, an engineer on Microsoft’s Windows UI team, didn’t mince words at the company’s Build 2026 developer conference. “The first and foremost is performance, fundamentals, quality, fixing a lot of bugs,” he said, explaining why WinUI’s headline feature work — new DataGrid and Charting controls — would take a back seat until the framework itself runs leaner. The remarks, reported by Windows Latest, confirm what many Windows 11 users have suspected: the modern native apps built with WinUI are heavier than they should be, and that overhead is finally being treated as a crisis worth solving.

Microsoft is already validating memory, reliability, and performance improvements internally before shipping the WinUI-reliant Start menu and a new Agenda view in the Notification Center. Anderson noted that the work on memory usage and the shift to the Windows system compositor “has all actually hit the public in our Git repo,” meaning the code is out in the open for developers to scrutinize. For now, no release date has been set, and no precise RAM reduction figures have been shared — Microsoft won’t yet say whether a 300 MB app will drop to 250 MB or 200 MB.

What’s Actually Changing Under the Hood

Two technical shifts promise to deliver the biggest everyday impact: aggressive memory management and a move to the Windows system compositor.

Memory consumption isn’t just a number in Task Manager. Microsoft’s own performance documentation warns that when active apps displace data that had been resident in memory, Windows may need to trim or page out content and reload it from storage later — a slowdown users feel when switching back to the desktop or an app. WinUI apps don’t automatically suspend like UWP apps; they keep consuming memory while running, making proactive cleanup essential. The plan is to bake into the framework better defaults for releasing cached images, GPU resources, view-model data, and navigation pages when a window is minimized or hidden — taking cues from the company’s existing desktop memory-management guidance.

The compositor change is even more structural. Today, a WinUI app runs its own internal compositor (Microsoft.UI.Composition), which only has access to the pixels it drew. That creates boundaries that complicate transparency effects, WebView2 embedding, and smooth animation across app and system layers. By integrating with the Windows system compositor, the framework can cut redundant work, improve frame rates during resizing and animation, and give shell components a more natural fit with the rest of the desktop. For users, that should translate to fewer stutters when opening the Start menu or snapping windows.

The Start Menu Rebuild: Why It’s Worth the Wait

The rewritten Start menu is still coming, but Microsoft is wisely refusing to ship it until the foundation is solid. Windows Latest reports that the new menu will see “largely … no visible changes” at first; the real gains will be in reduced stutter and lower RAM consumption, especially on hardware with 4 GB or 8 GB of memory. That’s the right priority. The Start menu is the most-used surface in Windows — a delay after pressing the Windows key, a janky search animation, or creeping memory use after dozens of opens would instantly sour users on the whole OS. By nailing the fundamentals first, Microsoft increases the odds that the new menu feels lighter and more reliable than the XAML-based version it replaces.

Beyond the Start Menu: A Framework for the Long Haul

The memory push is just one piece of a broader course correction. Anderson admitted that WinUI still has “a ton of feature gaps” — proper system tray support, richer data controls — and that many developers rely on open-source libraries to fill them. The upcoming built-in DataGrid and Charting controls aim to close some of those gaps, making WinUI more attractive for enterprise apps that live or die on dense, interactive tables and charts. However, Microsoft concedes that using these controls won’t automatically cut an app’s RAM; they’re about parity, not magic.

Just as important as features is the signal of staying power. By dropping the version number and simply calling the framework “WinUI,” and by publicly stating there are no plans for yet another framework, Microsoft is trying to reassure teams burned by past transitions from Win32 to Windows Forms to WPF to UWP to WinUI 3. Trust will be earned over years, but the performance-first stance is the best opening argument the company has made in a decade.

What This Means for Your Daily Workflow

For home users and students on budget laptops or older desktops, the changes should make everyday Windows 11 tasks more responsive. The Settings app, Photos, and — eventually — the Start menu will hog less memory and react faster, leaving more headroom for web browsing and productivity. You won’t need to do anything but install regular Windows updates once the improvements roll out.

For power users who monitor Task Manager, the framework optimizations may lower the baseline memory footprint of the shell, which means more RAM available for intensive workloads like photo editing, coding, or virtual machines. If you’re already running a 32 GB desktop, the difference will be modest, but on an 8 GB travel laptop, it could be the margin that keeps the system from swapping to disk.

For developers, now is the time to review Microsoft’s expanded performance documentation for WinUI. Best practices like UI virtualization for ListView, deferred loading of XAML, and granular resource cleanup can already reduce app bloat today, and they’ll be even more effective once the underlying framework improvements land. IT admins should note that a lighter shell may extend the useful life of an organization’s existing fleet of low-cost Windows 11 devices.

For enterprise architects, the DataGrid and Charting additions signal a maturing platform, but bet only on what’s delivered. Evaluate WinUI for new projects if you can accept that some features are still in flight, but don’t rush to rewrite existing stable line-of-business apps until the performance gains are measured and proven.

The Outlook

Microsoft’s candor about WinUI’s shortcomings and its commitment to fixing them before adding more shell components is a rare and welcome move. The real test will come when the first wave of changes arrives in a stable Windows 11 update. A Start menu that opens instantly on a $300 laptop would be a powerful endorsement. If Microsoft can ship that, and then maintain a predictable cadence of improvements, WinUI could finally become the go‑to desktop platform the company has long promised. For now, expect incremental speed boosts in the next feature drops, with the real payoff arriving quietly — not in a flashy redesign, but in an operating system that simply feels lighter.