Windows 11 KB5074109: Security Fixes, AVD Login Regression, and GPU Issues

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Windows 11’s January cumulative update, KB5074109, landed with a heavy security payload—but within hours the patch became the source of multiple operational headaches for both gamers and enterprise users, with community reports of degraded gaming performance on NVIDIA GeForce cards, random black screens and display freezes, and a verified authentication regression that prevents some Azure Virtual Desktop and Windows 365 Cloud PC connections. The update fixes a large bundle of security issues and addresses an NPU-related battery drain, yet it also forced administrators and players into the awkward choice between preserving security posture and restoring system stability.

Background and overview​

KB5074109 is the cumulative security and quality rollup Microsoft released on January 13, 2026 for Windows 11 versions 24H2 and 25H2 (OS builds 26100.7623 and 26200.7623). The release is part of January’s Patch Tuesday and bundles the usual mix of fixes for the OS, firmware, and platform components. Security teams have reason to pay attention: this Patch Tuesday round addressed roughly 112–114 vulnerabilities across Microsoft products, including a small set of critical and actively exploited flaws. At the same time, the update includes non-security improvements such as a fix that prevents certain Neural Processing Units (NPUs) from remaining powered during idle—an important battery-life improvement for so-called “AI PCs.” Despite those legitimate security and power benefits, the rollout quickly produced two classes of high-impact problems:
  • A confirmed client-side authentication regression that prevents some users from launching AVD / Windows 365 Cloud PC sessions via the Windows App, producing authentication error code 0x80080005. Microsoft acknowledged the regression and published mitigation guidance including a Known Issue Rollback (KIR) and alternate connection paths.
  • Wide‑ranging community reports that installing KB5074109 correlates with GPU-related instability: reduced game frame rates, short black-screen freezes, driver crashes (nvlddmkm), and full application or system instability that in many users’ experience was resolved by uninstalling the update. These reports are concentrated among systems with NVIDIA GPUs but are not strictly limited to a single vendor by every account.
Both threads—enterprise authentication failures and consumer gaming/driver problems—are high-visibility because they affect core workflows: remote-desktop access for teams and interactive graphics performance for gamers and content creators.

What KB5074109 actually contains​

Security fixes and scope​

January’s cumulative rollup bundles a significant number of CVE fixes across Windows components, with research firms and security outlets counting roughly 112–114 tracked vulnerabilities addressed in the January 13 release. The distribution includes multiple elevation-of-privilege flaws, remote-code-execution fixes, and a small number of critical problems (including one actively exploited zero-day reported in public advisories). For defenders, the update is consequential: remaining unpatched increases exposure to known, fixable attack vectors.

Non-security improvements and platform changes​

The KB also includes quality fixes such as the NPU idle-power behavior correction and enhancements to how Windows batches Secure Boot certificate rollouts for devices. These are the sorts of deep platform changes that improve long-term stability and security in the field—but because they touch kernel and firmware surfaces, they are also the sorts of changes most likely to interact with third‑party drivers and enterprise client stacks. That interaction pattern is relevant to the regression surface we describe below.

The verified enterprise regression: AVD / Cloud PC authentication​

Symptom and impact​

Within hours of the rollout, some customers attempting to connect to Azure Virtual Desktop (AVD) or Windows 365 Cloud PCs using the Windows App client saw immediate failures at the credential prompt. The consistent symptom in multiple reproductions was an authentication error reading essentially “An authentication error has occurred (Code: 0x80080005),” with no session establishment. The failure happens before a full session is negotiated—indicating a client-side regression in the credential or single-sign-on path rather than a backend cloud outage. Why this matters: AVD/Cloud PC is mission-critical for many organizations’ remote-work strategies. A client-side regression that prevents authentication is a synchronous outage for users and often necessitates fast mitigation by IT teams across entire fleets.

Microsoft’s response and mitigations​

Microsoft publicly acknowledged the issue in the KB entry and provided a mitigation strategy aimed at enterprise administrators:
  • Known Issue Rollback (KIR): a surgical mitigation that disables only the offending change, allowing organizations to retain the rest of the January security fixes without uninstalling the entire cumulative update. KIR artifacts are distributed through Microsoft management channels for managed devices.
  • Temporary fallbacks: Microsoft advised affected users to use the classic Remote Desktop client (MSRDC) or the Windows App web client (browser-based) until a permanent servicing fix ships. Uninstalling the cumulative update also restores connectivity in many reported cases, but that re-exposes devices to the security fixes the update provided.
The practical outcome for admins is a triage choice: apply KIR-wide to preserve security posture while restoring AVD access, or uninstall updates in isolated cases where KIR is not feasible. Microsoft signaled it is preparing a permanent remediation in a future update.

Gaming and GPU problems: what players are reporting​

Symptoms seen in the wild​

Across Reddit threads, community forums, and tech sites, multiple users report graphics anomalies and performance regression after installing KB5074109. The commonly reported behaviors include:
  • Sudden drops in frames per second (FPS) during games—some users have reported double-digit FPS losses (examples of 15–20 FPS drops appear in user reports), while others report more severe instability.
  • Intermittent short black-screen freezes or a brief loss of display that resolves without a full crash. Many affected users see the desktop recover after several seconds; others experience driver crashes logged as nvlddmkm or directx-related faults.
  • In a subset of reports, system instability persists until KB5074109 is removed, at which point performance and reliability return to prior levels. Community reproductions and troubleshooting posts recount uninstalling the update or restoring a pre-update system image as a reliable temporary remedy.

Vendor history and precedent​

This is not an isolated pattern in time. The Windows–GPU driver interaction cycle has produced notable cases before: a cumulative Windows update in October 2025 (KB5066835) created severe FPS and stability issues for many gamers, prompting NVIDIA to ship an emergency GeForce Hotfix driver to restore performance on affected systems. That incident shows how deep OS servicing changes can surface timing or resource interaction bugs that require vendor-side driver adjustments as well as OS servicing fixes. The October response set a clear precedent: when a Windows update changes kernel/graphics scheduling or driver interfaces, GPU vendors sometimes release hotfix drivers in response.

Root cause: what we know — and what we don’t​

The public evidence points to an interaction between the new Windows client builds and client-side graphics/authentication paths rather than a single explicit bug in NVIDIA drivers. That said:
  • The AVD authentication problem is acknowledged by Microsoft and documented with an official mitigation path. Its client-side nature and Microsoft’s mitigation strategy (KIR) are well substantiated.
  • The GPU and gaming anomalies are community-reported and reproducible in multiple cases, but Microsoft has not published a formal Known Issue for gaming or Graphics Kernel regressions tied to KB5074109 at the time of writing. Community telemetry strongly suggests the issues disproportionately affect NVIDIA-equipped systems—though other vendors’ hardware is mentioned in some threads—making it plausible the regression is a race/timing/driver-surface interaction. Until vendor and Microsoft engineering publish a definitive root-cause analysis, any line-by-line cause is speculative.
In short: AVD is a verified, documented regression with official mitigations; GPU and frame-rate complaints are credible and widespread but still rely mainly on community and third‑party reporting rather than a clear vendor-side confirmation tied to this exact KB.

Practical guidance: what affected users and admins should do​

The following recommendations are practical, conservative steps based on vendor guidance and community best practice. They balance security and operational continuity.

For enterprise administrators​

  • Immediately review your deployment status for KB5074109 in your management console and assess exposure across AVD users and Cloud PC fleets. Apply KIR if you operate managed devices that rely on the Windows App for AVD access—KIR preserves the rest of the update while disabling the problematic change.
  • If KIR is not deployable quickly, instruct affected users to connect using the Windows App web client or the classic Remote Desktop client as a temporary workaround. Consider targeted rollback only for devices that are mission‑critical to operations and where KIR cannot be applied.
  • Monitor Microsoft’s release-health and update channels for an out-of-band remediation and for any guidance that tightens the scope of affected builds. Coordinate with your vendor support channels (NVIDIA, OEMs) if you see GPU-related instability across managed hardware.

For gamers and consumer users​

  • Don’t panic, but be cautious. If you use your PC primarily for gaming and you see stability regressions or substantial FPS drops after installing KB5074109, test whether uninstalling the update restores performance. Windows Settings > Windows Update > Update history > Uninstall updates is the supported GUI path to remove a recently installed quality update. If the update is not listed there, the Windows Recovery Environment provides an Uninstall Updates option. Use these tools before attempting command-line workarounds.
  • Before uninstalling any security update, weigh the risk: KB5074109 fixes many CVEs. If you must remove the update to restore stability, try to do so temporarily and plan to re-protect the device (network isolation, firewall rules) until a vendor fix is available.
  • Update GPU drivers thoughtfully. Check NVIDIA’s GeForce driver channels for hotfix or beta drivers addressing any interaction with recent Windows servicing—vendor hotfixes have been used successfully for prior incidents. If you plan to reinstall drivers, consider a clean driver removal tool (such as Display Driver Uninstaller) followed by a fresh driver install; this can clear corrupted driver state that occasionally follows kernel-level updates. Recent history shows driver hotfixes can restore performance when Windows changes expose timing issues in the driver stack.
  • If you are an advanced user comfortable with command-line tools and you cannot access Settings, Microsoft documents a command-line uninstall option (wusa /uninstall /kb:5074109) and recovery options through Windows RE. These steps are more intrusive; create a full backup or a system restore point before proceeding. If you are uncertain, seek help from manufacturer support or a competent technician.

Risk analysis: what this episode reveals about Windows servicing​

Strengths: security-first practice is working​

Microsoft shipped a comprehensive security rollup that addresses more than a hundred vulnerabilities—an outcome security teams depend on to reduce real-world exposure. The inclusion of platform-level fixes (like the NPU power issue) demonstrates the vendor’s attention to new hardware surfaces and the evolving threat and reliability landscape. From a security posture perspective, timely patching of these CVEs is valuable and necessary.

Weaknesses: servicing complexity and ecosystem fragility​

Large cumulative updates touch deep system components, causing an unavoidable coupling between OS servicing and third-party drivers or enterprise authentication flows. When an update combines security fixes with platform behavior changes, the chance of unintended interactions increases.
  • Enterprise impact: The AVD regression shows how a client-side change can stop remote-work operations instantaneously. The presence of a Known Issue Rollback mechanism helped—but the initial impact highlights a fragility in how urgent rollouts and enterprise communication are synchronized.
  • Consumer impact: Gaming and GPU ecosystems are finely balanced stacks of OS scheduler, graphics drivers, and game engines. Small platform changes can produce outsized perceived regressions for end users, resulting in community uproar and support burdens.
The cycle of “Windows update causes problem → vendor issues hotfix driver → stability restored” is a functional coping mechanism, but it is not an ideal model for long-term user trust.

What to watch next​

  • Microsoft remediation: watch for an out-of-band servicing fix that addresses the AVD regression across the affected builds or an updated LCU that fixes the authentication path. Microsoft has signaled a remediation is in progress. Administrators should follow release-health and KB updates for a targeted patch.
  • GPU vendor responses: if NVIDIA (or other GPU vendors) identify a specific kernel/driver interface change that causes frame-rate drops or black screens, expect a hotfix driver targeted at affected builds. Historically, vendor drivers have restored performance where Windows updates changed graphics timing or resource behavior. Keep an eye on the GeForce driver release notes for any hotfixes that reference recent Windows servicing.
  • Post‑mortem transparency: given the scale of both security fixes and regressions, the community will benefit from a clear post‑mortem that explains root causes and engineering steps taken to close the loop between OS servicing teams and driver vendors. Greater telemetry sharing and earlier vendor coordination can shorten the cycle from regression discovery to remediation.

Quick checklist for affected users​

  • If you rely on AVD/Cloud PC and experience 0x80080005 errors: contact your IT team, apply KIR if available, or use the web client/classic Remote Desktop client as temporary alternatives. Avoid wholesale uninstall unless necessary.
  • If you are a gamer or creative professional with obvious performance regressions:
  • Test performance before and after uninstalling KB5074109 (using Settings > Update history > Uninstall updates).
  • Try a clean driver reinstall (DDU + fresh GeForce driver) if you prefer not to remove the Windows update immediately.
  • Isolate the change with a system restore point or image so you can revert quickly if needed.
  • If you administer a fleet: prioritize KIR deployment for affected endpoints, stage updates carefully, and communicate clear rollback/mitigation guidance to users to avoid unnecessary productivity loss.

Final analysis and conclusion​

Patch rollouts at the scale Microsoft performs are necessarily stressful balancing acts: they must reduce immediate security risk while minimizing the chance of collateral damage across an ecosystem of driver and management software. KB5074109 is a textbook example of that tension. On one side, it addresses over a hundred vulnerabilities and fixes platform-level battery behavior for NPU-enabled devices—objectively important outcomes for security and device usability. On the other side, a verified AVD authentication regression and a wave of GPU-related user reports exposed how quickly an update can disrupt both remote-work flows and the gaming experience.
The immediate takeaways are practical and strategic. Practically, IT teams should use the Known Issue Rollback pathway and alternate connection options to restore Cloud PC access while preserving security; gamers and consumers should test driver updates and consider temporary rollback only when necessary, keeping in mind the security trade-offs. Strategically, the episode reinforces the need for stronger coordination between OS engineering, hardware vendors, and enterprise communications so that when a servicing-induced regression appears, mitigations propagate faster and more transparently than they do today.
Expect further fixes from Microsoft and potentially targeted driver hotfixes from GPU vendors. Until then, careful triage—applied with a clear view of security versus availability trade-offs—remains the best path forward.
Source: OC3D New Windows update ruins Nvidia GeForce GPU performance - OC3D
 
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Microsoft’s January cumulative for Windows 11, KB5074109, shipped with a heavy security payload only to be followed by widespread reports that systems using Nvidia GeForce GPUs saw dramatic gaming slowdowns, driver instability, and other severe side effects—issues that many players have temporarily resolved by uninstalling the patch while Microsoft and Nvidia investigate corrective options.

Background​

Windows servicing patches frequently bundle dozens or hundreds of fixes across kernel, platform, and device‑driver interaction surfaces. That depth is necessary to keep systems secure, but it also increases the chance that a cumulative update will change timing, scheduling, or API behavior in ways that reveal edge‑case regressions in drivers or applications. The January 2026 rollup KB5074109 is another example: it intended to fix security issues and reduce battery drain on systems with Neural Processing Units (NPUs), yet it coincided with a cluster of high‑impact regressions for both gamers and enterprise customers.
This is not an isolated incident. An analogous event in October 2025 — the KB5066835 servicing wave — produced very similar symptoms: large frame‑rate drops and stuttering for many GeForce users until Nvidia issued an out‑of‑cycle hotfix to mitigate the problem. Those earlier events provide a useful precedent for how to triage, mitigate, and balance the competing priorities of security versus runtime stability.

What KB5074109 changed (quick technical overview)​

  • KB5074109 was distributed as a monthly cumulative update for Windows 11 (24H2/25H2 branches) and included a large set of security fixes—community reporting places the number of addressed vulnerabilities at roughly 112–114—plus non‑security improvements such as a fix intended to reduce NPU‑related battery drain.
  • As with any LCU (latest cumulative update), the package touches footprint areas that can influence graphics and scheduling behavior: kernel components, device‑driver interfaces (WDDM), power-management heuristics, and platform runtimes. Those changes can be invisible to the majority of users while impacting specific driver/hardware/game combinations.

Reported symptoms and the observed scope​

Gaming performance and frame‑rate drops​

Shortly after KB5074109 began circulating, community threads and user reports clustered around the same symptom set: measurable frame‑rate drops in demanding titles, increased micro‑stutter, and worse 1%/0.1% lows. Many affected systems were running Nvidia GeForce hardware, and some players reported FPS losses on the order of 15–20 frames per second in demanding scenes; independent testing in prior incidents showed even larger proportional losses in extreme cases. The pattern is heterogeneous—some titles and setups are hit much harder than others.

Stability issues beyond gaming​

Beyond lower FPS, users reported short black screens, driver crashes (nvlddmkm), and occasional complete application or system instability. The January patch also correlated with enterprise issues such as authentication failures in Azure Virtual Desktop (error 0x80080005 in some workflows) and file‑system oddities when formatting USB media to FAT32—both of which Microsoft acknowledged and provided mitigations for. These non‑gaming regressions increase the operational risk for IT admins who must weigh security against availability.

Who appears to be impacted​

  • The majority of public reports and the most reproducible cases involve NVIDIA GeForce GPUs, across a range of driver branches and GPU generations. That concentration suggests a driver ↔ OS interaction rather than a single hardware defect.
  • Not every configuration shows problems. The regression is workload‑dependent: titles that stress specific GPU/driver paths (modern DirectX 12 engines with many draw calls or aggressive CPU/GPU synchronization) are more likely to reveal the regression. Prior incidents showed variability by anti‑cheat middleware, overlay software, driver branch, and firmware.

How this mirrors the October 2025 KB5066835 incident​

The October 2025 cumulative, KB5066835, produced a near‑identical pattern: large, scene‑specific FPS regressions on some Nvidia systems, with community benches reporting drops in the 33–50% range for extreme cases (one widely reported instance saw ~72 FPS collapse to ~34 FPS in a particular scene). Nvidia’s response then was a targeted hotfix driver (GeForce Hotfix Display Driver 581.94) that restored performance for many affected users; that hotfix later fed into a WHQL Game Ready driver. The lifecycle—OS update, community reports, vendor hotfix, integration into stable driver—serves as an operational template for the current KB5074109 incident.
Key lessons from the October incident that apply now:
  • Rapid vendor hotfixes can mitigate symptoms quickly but may carry a narrower QA cycle.
  • Root causes are often interaction effects at the OS/driver boundary, not strictly a single vendor’s fault.
  • Enterprise admins benefit from staging and pilot deployments rather than broad, immediate rollout of monthly LCUs.

Possible technical causes (analysis)​

While the precise root cause for KB5074109’s GeForce impact is not yet public, the technical profile points to a small set of plausible classes of interaction:
  • Driver ↔ OS scheduling changes: Updates that adjust kernel timing, interrupt handling, or scheduler behavior can change how CPU/GPU synchronization occurs, leading to worse frame pacing even with high GPU utilization. This was a central hypothesis in the October regressions.
  • Graphics stack or compositor modifications: LCUs sometimes touch components in the DirectX/DWM/DXGI stack. Even subtle changes in composition or buffered frame handling can alter throughput for certain rendering paths.
  • Power management / NPU battery fixes: The KB5074109 update specifically included an improvement aimed at preventing NPUs from remaining powered during idle. Changes to power management policies can unintentionally affect GPU boost states or background thread scheduling, which, in tight rendering loops, can reduce effective throughput. This is plausible given the content of the update.
  • Driver assumptions invalidated by tightened security or subsystem changes: Kernel‑level security hardenings or altered device‑driver interaction surfaces might cause drivers to take slower codepaths or avoid previously used optimizations. These interaction effects can be subtle and hard to reproduce in lab environments that don’t match specific user workloads.
Because these failures typically surface at the OS ↔ driver boundary, the practical mitigations are usually either a vendor driver update (Nvidia) or a rollback/patch from Microsoft that reverts the problematic OS change (KIR). Both vendors may need to collaborate to determine which side should change.

Immediate mitigations and recommended steps​

The next actions depend on whether the reader is a gamer, a content creator, or an IT administrator. Each group faces a trade‑off between security and availability.

For gamers and individual users​

  1. Pause Windows updates temporarily if you have not installed KB5074109 and you rely on peak gaming performance. Create a system image or restore point before making changes.
  2. If KB5074109 is already installed and you see degraded FPS or instability, test the following:
    • Install the latest Nvidia drivers (check GeForce Experience and Nvidia support channels) — vendors often release hotfixes or updated WHQL drivers that fold in fixes. If a hotfix is available, test it against a controlled benchmark to confirm improvement.
    • If driver updates do not help, uninstall KB5074109 or use System Restore to revert to a point prior to the update. For users who must roll back, remember that uninstalling a cumulative update can remove many security fixes; do this only as a temporary mitigation and re‑enable security controls where possible. Microsoft’s KB documentation and Known Issue Rollback (KIR) guidance may offer safer mitigation paths.
    • Use driver cleanup tools (Display Driver Uninstaller) and then perform a clean install of the Nvidia driver if you switch branches or return from a rollback.
  3. Capture objective measurements before and after any change (use tools like CapFrameX, FRAPS, built‑in benchmarks, or in‑game overlays) so you can quantify impact and avoid anecdote‑driven toggles.

For IT administrators and enterprise environments​

  • Treat KB5074109 as a high‑impact update to be staged: pilot on a limited set of endpoints (including representative GPU/driver builds) before broad deployment. The January rollup includes many security fixes; do not leave critical enterprise assets unpatched without compensating controls.
  • If your environment uses Azure Virtual Desktop or Windows 365 Cloud PC, evaluate the AVD authentication guidance Microsoft published for known regressions and apply the recommended mitigations or KIR (if available). Rolling back should be a last resort and performed with a documented rollback plan.
  • Keep a vendor‑coordinated playbook ready: validated driver versions, rollback commands for LCUs (wusa /uninstall /kb:5074109), and user‑communication templates explaining the trade‑offs between stability and security.

Strengths of vendor responses so far​

  • Microsoft acknowledged the authentication and formatting regressions associated with KB5074109 and provided mitigation guidance and KIR options for enterprise customers—actions that reflect a responsible support posture for high‑impact regressions.
  • Nvidia has a history of producing rapid hotfix drivers to address Windows-triggered regressions; the October 2025 hotfix (581.94) restored performance for many users and later became part of a stable WHQL release. That rapid mitigation model reduces downtime for gamers while a more thoroughly validated driver is prepared. The precedent suggests Nvidia can and likely will respond promptly if a driver-level workaround is appropriate.

Risks and unresolved questions​

  • Uninstalling a cumulative update like KB5074109 removes security fixes. For end users and organizations that handle sensitive data, rolling back must be combined with compensating safeguards; otherwise, the environment becomes vulnerable to the very exploits Microsoft patched. This is the central trade‑off and it’s not negotiable: security posture vs. runtime performance.
  • The root cause is not yet publicly verified. Early community reporting is consistent with an OS/driver interaction, but until Microsoft and Nvidia publish technical details or coordinated advisories, any explanation remains partly speculative. Readers should treat proposed root causes as plausible hypotheses until vendor post‑mortems are available.
  • Hasty adoption of vendor hotfixes carries risk. Hotfix drivers are typically rolled out with an abbreviated QA cycle; while they can restore performance quickly, they may also introduce edge‑case side effects in other workloads. IT teams should pilot any hotfix before rolling it out widely. The October incident demonstrated both the value and the limits of the hotfix approach.

Practical checklist (clear, actionable)​

  • If you are a performance‑sensitive user with an Nvidia GPU:
    • 1. Record baseline performance with a controlled benchmark.
    • 2. Check Nvidia’s support channels for a hotfix or updated WHQL driver and test it in a controlled environment.
    • 3. If drivers do not resolve the regression and you need immediate relief, use System Restore or uninstall KB5074109 as a temporary measure—document this and repatch when a safe fix arrives.
  • If you manage updates for others:
    • 1. Block or defer KB5074109 in your deployment rings while you perform targeted testing on machines representative of your fleet.
    • 2. Maintain an approved driver list (including any vendor hotfixes you have validated) and a rollback runbook.
    • 3. Monitor vendor advisories and telemetry, and prepare communications explaining the security/performance trade‑offs to stakeholders.

What to watch for next​

  • Official vendor advisories: Microsoft may publish a Known Issue Rollback or a follow‑up patch if the regression is confirmed to be caused by a specific change in KB5074109. Nvidia may publish an interim hotfix driver or fold corrective changes into an upcoming WHQL Game Ready driver. Those official notices will narrow down the root cause and provide safe, supportable fixes.
  • Independent test verification: look for controlled benchmark results from editorial labs and impartial testers. The October incident’s robust coverage (which included side‑by‑side benches that quantified the regression and subsequent recovery) helped vendors and admins make informed decisions; the same level of verification will be useful here.
  • Microsoft/Nvidia collaboration notes: if the problem truly sits at the OS/driver boundary, coordinated public statements or joint guidance will be the most reliable path to resolution. Until those statements arrive, treat anecdotal reports as signal but not definitive proof.

Conclusion​

KB5074109 underscores the fundamental tension in modern Windows servicing: the need to deliver broad security hardenings and quality fixes while preserving the intricate, timing‑sensitive interactions that high‑performance graphics workloads rely on. The observed regressions affecting Nvidia GeForce users mirror a known class of OS ↔ driver interaction failures first seen in October 2025, and the historical response model—vendor hotfix, validation, then stable driver integration—remains the practical path forward. In the interim, affected gamers and administrators should adopt disciplined measurement, staging, and rollback strategies, balancing the immediate need for playable frame rates against the longer‑term imperative to keep systems patched and secure.
Source: eTeknix Windows 11 Update Causes Performance Issues for GeForce GPUs
 
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