Windows 11 October Update Auto-Enables Memory Integrity: 5 to 10 Percent FPS at Risk [2026]
Friday, September 11, 2026Updated September 11, 2026: October's Patch Tuesday update will auto-enable the Memory Integrity security feature on millions of Windows 11 PCs, per HotHardware's September 3 report, and gamers could pay for it in frame rates. Memory Integrity, also called HVCI, has a documented history of costing 5 to 10 percent of gaming performance. Microsoft itself tells gamers how to switch it off. Here is what auto-enables, what it costs, and the exact steps to check your PC before October 13.
Table of Contents
- What Auto-Enables on October 13
- What Memory Integrity Actually Does
- The FPS Cost: 5 to 10 Percent
- Microsoft Tells You to Turn It Off
- How to Check Your PC in 30 Seconds
- How to Toggle It Safely
- Security vs. Frames Tradeoff
- Who Gets Hit and Who Does Not
- Windows 11's Gamer Problem
- Bottom Line
- Frequently Asked Questions
1. What Auto-Enables on October 13
HotHardware reported September 3, 2026 that October's Patch Tuesday update will auto-enable a memory security feature for millions of Windows PCs, with gaming performance as the collateral. PCMag's regional edition carried the same warning the same day: Microsoft is set to enable Memory Integrity in Windows 11 by default where it is not already on. Patch Tuesday falls on the second Tuesday of each month, which puts the October update on October 13, 2026.
Auto-enable matters because most gamers never touched this setting. Memory Integrity ships off on many upgraded machines and on by default on new Windows 11 devices with compatible hardware. An update that flips it on silently changes performance characteristics overnight, and the first symptom most users will notice is lower frame rates in games they played fine the week before, with no obvious cause.
This is the second Patch Tuesday story in two months with direct gaming consequences. Our September Patch Tuesday coverage tracked a record 650 fixes, and October's update now adds a performance dimension on top of the security one. Mark October 13 on the calendar if you game on Windows.
2. What Memory Integrity Actually Does
Memory Integrity is the consumer name for Hypervisor-Protected Code Integrity, or HVCI, part of Windows' Virtualization-Based Security. It uses virtualization to wall off high-security processes so malicious code cannot inject itself into them. HotHardware's 2022 explainer put it plainly: the feature "prevents attacks from inserting malicious code into high-security processes," and memory vulnerabilities are among the most common malware entry points.
The protection is real, not theater. Driver-level attacks and credential theft techniques that target kernel memory genuinely struggle against HVCI. Enterprise environments mandate it for good reason. The question was never whether the security works. It is whether every home gaming PC needs it running during every gaming session, which is the question Microsoft itself answered in 2022.
The companion toggle is Virtual Machine Platform, or VMP, the Windows feature that supports virtualization workloads. Most gamers never use it directly, but it runs services in the background once enabled, and Microsoft groups it with Memory Integrity in its gaming guidance. Both ship in states most home users never chose deliberately, and October's update changes the default for the more impactful of the two.
3. The FPS Cost: 5 to 10 Percent
The performance cost is documented across multiple rounds of testing. Tom's Hardware, covering Microsoft's own 2022 gaming guidance, estimated the difference with these security options on versus off at approximately 5 to 10 percent, based on early Virtualization-Based Security and HVCI toggle testing around the Windows 11 launch. That range has held up as the working figure ever since.
HotHardware's own 2022 testing made it concrete. Disabling Core Isolation's Memory Integrity plus Virtual Machine Platform gained roughly 5 FPS average in Shadow of the Tomb Raider on their test system, with minimum frame rates improving even more than averages. Minimums matter most to feel: a 5 FPS average gain that smooths the worst 1% lows is a bigger upgrade than the headline number suggests.
Scale that to modern hardware and the absolute numbers grow. Five to ten percent on a 60 FPS baseline is 3 to 6 FPS. On a 144Hz competitive setup it is 7 to 14 FPS, the difference between holding a refresh target and missing it. WindowsForum's counterpoint deserves airtime too: on a modern PC the gains rarely justify disabling the protection for general use, because 5% of a fast system is invisible outside benchmarks. Both claims are true for different users, which is why the tradeoff section below splits by use case.
4. Microsoft Tells You to Turn It Off
The remarkable part of this story is that the vendor blesses the workaround. In 2022 Microsoft published an official blog post with tips for gamers on optimizing Windows 11 performance, and its two recommendations were turning off Memory Integrity (HVCI) and turning off Virtual Machine Platform. Tom's Hardware noted Microsoft warns that once toggled off "the device may be vulnerable to threats," then provides step-by-step walkthroughs with screenshots anyway.
Microsoft's framing is session-based: toggle the features off for gaming, accept the exposure window, toggle back on after. The company states these features are on by default on new Windows 11 devices for a reason, and explicitly describes the gamer exception as temporary. It is official permission with an official warning label attached.
That framing is exactly why the October auto-enable stings. Users who deliberately disabled Memory Integrity for gaming, following Microsoft's own guidance, will have it switched back on by the update. The setting they chose gets unchosen silently. Checking after every Patch Tuesday becomes maintenance, which is the practical takeaway of this entire article.
5. How to Check Your PC in 30 Seconds
Open the Start menu, type Core Isolation, and select the Core Isolation result. That opens Windows Security directly on the Core Isolation page, where the Memory integrity toggle shows its current state. If it reads On after October 13 and you did not turn it on, the update did. This check takes under a minute and answers the whole mystery of sudden post-update slowdowns.
For Virtual Machine Platform, open Start, type Windows features, and select Turn Windows features on or off. Scroll to Virtual Machine Platform and note whether its box is checked. Unless you develop software or virtualize operating systems, a checked box is background cost for nothing, and unchecking it is safe to test.
Do both checks before October 13 to record your baseline, then repeat after the update installs. If Memory Integrity flipped from your chosen Off to On, you have caught the auto-enable in the act and can decide deliberately rather than discovering it through lost frames. Gamers who benchmark should log a quick before-and-after in one favorite title. Three runs of a built-in benchmark, same settings, takes ten minutes and ends all guessing.
6. How to Toggle It Safely
To disable Memory Integrity, return to the Core Isolation page described above and switch Memory integrity off. To disable Virtual Machine Platform, uncheck its box in the Windows features dialog. Both changes require a restart to take effect. Verify the new state after rebooting, then run your benchmark or game to confirm the gain before assuming anything.
The safe pattern is Microsoft's own: off for gaming sessions, on for everything else. Toggling twice per session is annoying, so most gamers pick a posture and keep it. Competitive and high-refresh players usually leave both off permanently and compensate with standard hygiene: updated browsers, reputable downloads, no sketchy executables. General-use PCs, family machines, and work laptops should keep both on, because the 5% costs less than a compromise.
Never toggle blind. If a game stutters after October 13, check the setting first, change one thing at a time, and measure. Our Windows 11 diet coverage showed how much background cost the OS carries, and Memory Integrity is one more line item in that ledger. Our Windows 11 control presets piece covers the broader tuning picture for readers going further.
7. Security vs. Frames Tradeoff
| Setup | Performance Effect | Recommendation |
|---|---|---|
| Memory Integrity on, VMP on | Baseline after October update, roughly 5 to 10% below tuned state | Default for work PCs, family machines, general use |
| Memory Integrity off, VMP on | Most of the gaming gain recovered, virtualization available | Balanced choice for mixed gaming and productivity PCs |
| Both off | Full 5 to 10% recovery, best minimums, per HotHardware and Tom's testing | Competitive and high-refresh gamers with good download hygiene |
| Session toggling | Best of both, costs two restarts per session | Microsoft's official advice, practical for almost nobody |
8. Who Gets Hit and Who Does Not
Hit hardest: high-refresh competitive players on 144Hz-plus displays, where 5 to 10 percent decides whether frame rate holds the refresh target. Also hit: budget PC owners, where the same percentage comes out of an already thin margin, and anyone who followed Microsoft's 2022 guidance to disable the feature and will now find it silently re-enabled.
Barely affected: GPU-bound 4K players, where the graphics card is the bottleneck and CPU-side virtualization overhead hides inside GPU wait time. Unaffected: anyone already running with both features on who never benchmarked the difference, because nothing changes except the knowledge of what it costs. And enterprise machines should ignore this article entirely. Managed security policy outranks frame rates.
The cruelest combination is budget hardware plus auto-enable. The PCs least able to spare 5% are the most likely to have Memory Integrity flipped on without their owners understanding why performance dipped. If you help friends or family with PCs, the October update is worth a conversation, not just a toggle.
9. Windows 11's Gamer Problem
This episode fits a pattern. Windows 11 launched with VBS-related performance questions, Microsoft published gamer workarounds for its own defaults, and four years later an update re-enables the exact setting gamers were told they could disable. Each step is defensible in isolation. Together they read as an OS negotiating with its gaming audience through defaults rather than dialogue.
The deeper tension is architectural. Virtualization-based security genuinely protects against real attack classes, and Microsoft's security teams are right to push it everywhere. But gaming is the workload most sensitive to the overhead and least tolerant of silent changes, and Windows remains the only serious PC gaming OS. Gamers cannot vote with their platform, so they vote with toggles, and updates that reset toggles feel like the vote being discarded.
There is a better version of October 13. Ship the auto-enable with a notification explaining the gaming cost and linking Microsoft's own toggle guide. Respect the user's previous explicit choice instead of overwriting it. Neither costs engineering time worth mentioning. Until then, the community documents the behavior itself, which is what this page is.
10. Bottom Line
Check your Memory Integrity setting before October 13, check it again after, and decide deliberately. The 5 to 10 percent at stake is real, documented by Tom's Hardware and HotHardware testing, and Microsoft's own guidance concedes the tradeoff. Auto-enable without notice is the actual offense here, not the security feature, which does its job well.
Competitive players and budget owners should turn both toggles off and keep them off with sensible hygiene. Everyone else should leave the protection on. Either posture beats the worst outcome, which is losing frames to a setting you never chose and never checked. Ten minutes with Core Isolation and Windows Features buys certainty either way.
Frequently Asked Questions
Q: Will Windows 11 auto-enable Memory Integrity in October 2026?
A: Yes, per HotHardware's September 3, 2026 report. October's Patch Tuesday update, expected October 13, will auto-enable the Memory Integrity security feature on millions of Windows 11 PCs where it is currently off. PCMag carried the same warning.
Q: How much FPS does Memory Integrity cost?
A: Approximately 5 to 10 percent, per Tom's Hardware's estimate from VBS and HVCI toggle testing. HotHardware measured about 5 FPS average improvement in Shadow of the Tomb Raider after disabling Memory Integrity plus Virtual Machine Platform, with even bigger gains in minimum frame rates.
Q: Does Microsoft allow turning Memory Integrity off for gaming?
A: Yes. Microsoft's official 2022 gaming guidance tells users to disable Memory Integrity (HVCI) and Virtual Machine Platform for better performance, with step-by-step instructions, while warning the device may be vulnerable to threats. The recommended pattern is off for gaming sessions, on otherwise.
Q: How do I check if Memory Integrity is on?
A: Open Start, type Core Isolation, and open the result. Windows Security shows the Memory integrity toggle state on the Core Isolation page. Check before October 13 to record your baseline, then check again after the update to catch any silent flip.
Q: Should I disable Virtual Machine Platform too?
A: If you do not develop software or virtualize operating systems, yes. It runs background services most gamers never use, and Microsoft groups it with Memory Integrity in its gaming guidance. Uncheck it in the Turn Windows features on or off dialog and restart.
Q: Is disabling Memory Integrity dangerous?
A: It removes a real layer of protection against kernel memory attacks, so the risk is nonzero. For general-use and work PCs the protection is worth more than the frames. For dedicated gaming rigs with careful download habits, Microsoft itself considers the tradeoff acceptable during gaming sessions.
Byline: Indie Kings | September 11, 2026
Labels: Windows
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