A widely distributed December cumulative update for Windows 11 — KB5072033 — quietly changed the startup behavior of a core app deployment service and, for a significant subset of PCs, turned routine background activity into persistent resource pressure that can make systems sluggish, noisy in...
Microsoft’s December servicing rollup quietly flipped a key Windows service to always‑on, and the change is already producing a mix of improved reliability in some scenarios and real performance headaches for others.
Background / Overview
On December 9, 2025 Microsoft shipped the cumulative...
Windows’ Delivery Optimization — the peer‑assisted engine that was designed to reduce bandwidth and speed updates — has been linked to steady, sometimes dramatic RAM growth on a subset of Windows 11 and Windows 10 machines, and the fastest, reversible way to restore responsiveness for many users...
Microsoft’s December cumulative—KB5072033—promised security and reliability fixes, but a seemingly minor configuration change to the AppX Deployment Service (AppXSVC) has produced tangible slowdowns, monitoring noise, and management headaches across some Windows 11 and Server 2025 installations...
A quiet line in Microsoft’s December cumulative—KB5072033—has become a loud headache for some Windows 11 users: the AppX Deployment Service (AppXSVC), previously a trigger-start component that only ran when needed, was flipped to an Automatic startup type, and that change is linked to noticeable...
Delivery Optimization — the Windows subsystem that quietly shares update chunks between PCs — has been linked to a wave of memory‑consumption complaints on Windows 11 24H2 and 25H2 after December servicing, producing steady RAM growth in DoSvc (Delivery Optimization service) hosts, severe...
Windows 11’s built‑in update‑sharing engine, Delivery Optimization (service name DoSvc), is being blamed for steady RAM growth on many machines running 24H2 and 25H2 — a symptom that looks and behaves like a memory leak and that has left some 8 GB and 16 GB systems sluggish or unusable unless...
A quietly running Windows service that once aimed to save bandwidth is now generating an unusually loud chorus of user reports: the Delivery Optimization engine (DoSvc) has been implicated in sustained memory growth on some Windows 11 systems, and recent servicing changes to a related component...
Multiple independent reports from community forums and tech outlets show the Delivery Optimization service (DoSvc) in recent Windows 11 and Windows Server builds can grow its memory footprint steadily over time, producing severe RAM pressure on low‑spec devices and some server images...
Microsoft’s Delivery Optimization — the peer‑to‑peer engine that can speed up Windows Update and Store app installs — has been flagged by users as growing its memory footprint steadily over time on some Windows 11 machines, and there’s a simple fix that most users can apply right now to stop it...
Microsoft's December cumulative updates have landed with a mixture of performance wins and operational headaches: the AppX Deployment Service (AppXSVC) is now set to Automatic in KB5072033 for Windows 11 24H2/25H2 and Windows Server 2025, a change that can increase memory and CPU activity on...
A routine December cumulative update for Windows 11 quietly flipped a long‑standing service behavior and — for a subset of users — translated into real, measurable system impact: the AppX Deployment Service (AppXSVC), the kernel component responsible for Microsoft Store package deployment and...
Microsoft’s December cumulative update, KB5072033, fixed several visible quirks in Windows 11 but also introduced quieter service‑level changes that some users now blame for unexpectedly high RAM use — most notably reports that the Delivery Optimization service (DoSvc) and a reconfigured AppX...
Microsoft’s December cumulative update KB5072033 quietly flips the AppX Deployment Service (AppXSVC) from a trigger-start service into one that launches automatically at boot — a small change on paper that has already produced measurable headaches for some users and administrators, including...
Microsoft’s December cumulative update for Windows 11 quietly flipped the AppX Deployment Service (AppXSVC) to an automatic startup, a change that Microsoft frames as a reliability improvement but which has already produced measurable headaches for some users and administrators — from spiking...
Microsoft’s December cumulative rollup for Windows 11, published as KB5072033, quietly changed a long‑standing service startup policy: the AppX Deployment Service (AppXSVC) — the background engine that handles Microsoft Store app installation and updates — is now configured to start...