Your Copilot+ laptop feels sluggish — apps take a beat longer to open, games stutter, and Task Manager shows nothing obviously wrong. A forum thread blames Virtualization-Based Security, and the toggle is right there in Windows Security tempting you to switch it all off for speed.

On Windows 11 on ARM, VBS and HVCI (Memory Integrity) do add measurable overhead: the hypervisor isolates secure memory regions and validates drivers at load. But on current Snapdragon, Intel, and AMD AI PCs that cost is small — typically low single-digit percentages. When a laptop feels noticeably slow, the culprit is almost always something VBS is exposing (a bad driver, a misconfigured policy) rather than VBS itself. Disabling it for a 3% gain while leaving the real problem in place is the worst trade in this guide.

This guide gives you six fixes in technician order: measure the actual impact first, then eliminate the common impostors, then tune what remains. You will keep VBS and HVCI on — and end up with a faster laptop than the toggle-off shortcut would give you.

Why this happens

  • An HVCI-incompatible driver adds latency: When HVCI has to work around or block a non-compliant driver, the resulting overhead dwarfs the normal VBS cost — updating that driver often “fixes VBS slowness” overnight.
  • Firmware TPM (fTPM) stutter on some platforms: Early fTPM implementations caused micro-stutter that users blamed on VBS; firmware updates resolved most of it, but stale BIOS versions still show it.
  • Background AI workloads compete for resources: NPU-accelerated features (Studio Effects, Recall indexing) run constantly on Copilot+ PCs; their CPU/GPU side-effects get misattributed to virtualization overhead.
  • Virtualization features stacked unnecessarily: VBS plus Hyper-V plus Windows Sandbox plus WSL2 all consume hypervisor resources; enabling everything at once multiplies overhead for no benefit.
  • Power plan fighting the hypervisor: “Best power efficiency” modes throttle the very cores VBS relies on, making the security overhead feel much larger than it is on Balanced or Best performance.
  • Misattributed thermal throttling: A laptop that thermal-throttles under load feels slow in exactly the workloads where people test VBS impact — the heat, not the hypervisor, is the bottleneck.

How to fix it

Work through these in order — diagnose first, then act.

Fix 1: Measure the real VBS impact before changing anything

Do not tune what you have not measured. A quick benchmark with VBS on establishes the baseline; most users discover the gap is far smaller than forums suggested.

  1. Note your current settings: Windows Security > Device security > Core isolation — record whether Memory Integrity is on.
  2. Run a repeatable benchmark (Cinebench, Geekbench, or a timed app launch) three times and average the result — this is your VBS-on baseline.
  3. Open Task Manager > Performance during normal use and note CPU, GPU, and NPU utilization — if nothing is saturated, the “slowness” may be latency or perception rather than throughput.
  4. Check Settings > System > Power & battery and set Power mode to Best performance for the test; efficiency modes exaggerate every overhead.
  5. Write the baseline numbers down. You will compare against them in Fix 6 — and you will likely find the real fix elsewhere in this guide.

Fix 2: Update every driver to HVCI-compatible versions

A single outdated driver under HVCI can cost more performance than all of VBS combined. This is the highest-value step in the guide: bring the whole driver stack current.

  1. Open Windows Security > Device security > Core isolation and use Review incompatible drivers — any flagged driver is suspect number one.
  2. Download the full current driver bundle for your exact model from Dell , HP , or Lenovo — graphics, NPU, chipset, and storage drivers together, not just one.
  3. Install everything as administrator on AC power, restarting when prompted between major components if the installer asks.
  4. After restarting, recheck the incompatible-drivers list — it should be empty — and rerun your Fix 1 benchmark.
  5. If scores jumped, the “VBS slowdown” was a driver problem all along. Keep the drivers current with the maker’s update utility rather than relying on Windows Update alone.

Fix 3: Trim the virtualization stack to what you actually use

VBS is the baseline; the optional hypervisor features stacked on top of it are where overhead accumulates. Most users run several they never touch.

  1. Open Control Panel > Programs > Turn Windows features on or off and review what is checked: Hyper-V, Virtual Machine Platform, Windows Hypervisor Platform, Windows Sandbox.
  2. Uncheck Windows Sandbox if you never use it — it reserves hypervisor resources just by being enabled.
  3. Keep Virtual Machine Platform only if you actively use WSL2; otherwise uncheck it too.
  4. Leave the core VBS/Memory Integrity protection itself enabled — you are trimming optional features, not the security baseline.
  5. Restart and rerun your benchmark; also watch for NPU usage spikes while the laptop idles in Task Manager afterward, since a leaner hypervisor stack changes how background AI workloads schedule.

Fix 4: Fix the power and thermal side of the equation

Overhead only hurts when the CPU has no headroom. Power and thermal tuning give VBS the headroom it needs, which shrinks its perceived cost to nothing.

  1. Set Settings > System > Power & battery > Power mode to Balanced (or Best performance when plugged in) — sustained efficiency-mode throttling is the most common VBS scapegoat.
  2. Check that vents are clear and the laptop is on a hard surface; run a 10-minute stress test and watch Task Manager CPU speed — if it drops well below base clock, you are thermal-throttling.
  3. Update the BIOS from your maker’s support page — firmware updates regularly improve fan curves and power delivery on Copilot+ models.
  4. In Settings > System > Display > Graphics, set your heavy apps (games, editors) to High performance so they get the discrete/high-power GPU path instead of sharing constrained resources.
  5. Rerun the benchmark on AC power with the charger connected — battery-mode results are not comparable and will mislead the VBS investigation.

Fix 5: Investigate background AI and system workloads

Copilot+ PCs do more in the background than traditional laptops. Those workloads — not VBS — are often what users feel as sluggishness.

  1. Open Task Manager > Processes, sort by CPU, and let it sit for two minutes — look for Windows AI components, search indexing, or photo analysis consuming steady CPU.
  2. Check the NPU tile in Task Manager > Performance during idle; constant activity there means background AI features are running even when you are not.
  3. In Settings > Privacy & security, review Recall & snapshots (if present) and search indexing scope — narrowing what gets indexed reduces background load measurably.
  4. Look at Startup apps in Task Manager and disable anything you do not need at boot; OEM utilities are frequent silent consumers.
  5. If you find the system logging repeated AI-component failures, dig into NPU error entries in Event Viewer — a crashing AI service retrying in a loop looks exactly like “VBS made my laptop slow,” and Procyon AI inference errors on the NPU are the benchmark-world version of the same symptom.

Fix 6: Re-measure, then decide with data

Only now — with current drivers, a trimmed virtualization stack, proper power settings, and quiet background — is a VBS on/off comparison honest. Run it and let the numbers decide.

  1. Rerun your Fix 1 benchmark three times with VBS and Memory Integrity on; average the results.
  2. As a one-time diagnostic, disable Memory Integrity in Core isolation, restart, rerun the benchmark three times, then re-enable it immediately regardless of the outcome.
  3. Compare: on current Copilot+ hardware the difference is typically 1–5%. If yours is far larger, something from Fixes 2–5 is still unresolved — do not accept a big gap as “just VBS.”
  4. Check Microsoft’s Windows support pages for current VBS guidance if your numbers look anomalous; platform updates continue to reduce overhead.
  5. Leave VBS and HVCI enabled. You now have a faster laptop and the protection — which was the actual goal, even if a forum thread told you otherwise.

Closing

VBS and HVCI cost a little performance on ARM laptops — but “a little” is the key phrase. Big slowdowns blamed on virtualization are almost always outdated drivers, stacked hypervisor features, aggressive power modes, or background AI workloads. Measure first, fix the real bottleneck, and keep the security on: the toggle-off shortcut is the most expensive performance advice on the internet.

Frequently asked questions

Do VBS and HVCI slow down ARM laptops?
They add a small overhead — typically single-digit percentages on modern Copilot+ PCs — because virtualization-based security isolates memory and verifies drivers. Large slowdowns usually come from an incompatible driver or misconfiguration, not from VBS itself.
Should I disable VBS to make my laptop faster?
Disabling VBS/HVCI trades meaningful protection against kernel attacks for a modest speed gain, and it is not recommended. Most real-world slowness blamed on VBS is actually caused by something else — measure first, then tune.
Why is my Copilot+ PC slower than reviews promised?
Review units often run with default settings too, so a big gap usually means a driver problem, thermal throttling, or background AI workloads — not VBS alone. Check Task Manager for the real bottleneck before changing security settings.
Can HVCI cause stuttering in games or creative apps?
An HVCI-incompatible or outdated driver can add latency that feels like stuttering. Updating GPU and NPU drivers to HVCI-compatible versions usually removes the stutter while keeping protection enabled.