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Windows on Arm can run traditional x86 software, but it does so by translating the program’s machine instructions into Arm64 instructions while the app runs. Windows 11 supports both x86 and x64 user-mode apps; Windows 10 on Arm supports x86 apps only. Translation and compatibility layers add overhead, while Windows 11 24H2’s Prism emulator uses translated-code caching and other optimizations to reduce that cost. The result can be very usable, but performance depends on the app, workload, processor, Windows version and architecture-specific dependencies.
What Windows on Arm emulation supports
Arm processors use a different instruction set from the x86 and x64 processors for which most traditional Windows desktop software was compiled. Rather than requiring every application to be rebuilt before it can run, Windows includes an emulation system that presents compatibility layers to the application and translates its processor instructions for the Arm64 CPU.
| Windows edition | Emulated application architectures | Important boundary |
|---|---|---|
| Windows 11 on Arm | x86 and x64 user-mode applications | Drivers and other kernel-mode components still need Arm64 builds. |
| Windows 10 on Arm | x86 user-mode applications | x64 application emulation is not supported. |
“User mode” includes the normal executable code and many libraries used by desktop applications. It does not include kernel-mode drivers. An x86 or x64 application can therefore open successfully while a printer driver, hardware monitor, antivirus component, VPN driver or other low-level feature fails because that component must be compiled for Arm64.
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- Native Arm64: the application and its relevant libraries are compiled for Arm64 and execute without instruction translation.
- Emulated x86 or x64: the original machine code remains x86 or x64 and Windows translates it for the Arm processor.
- Arm64EC hybrid: Arm64EC code runs natively in a Windows 11 process while x64 portions continue through built-in emulation.
An application’s main executable is only one part of the compatibility picture. Plug-ins, shell extensions, codecs, database engines, security tools and hardware integrations can each have their own architecture requirements.
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How the translator actually runs an x86 or x64 app
Windows does not simply read one original instruction, emulate it, discard the result and repeat that process forever. The emulator works with blocks of x86 instructions. At runtime it translates a block into Arm64 instructions, applies optimizations to the generated code and executes that Arm64 version.
Translation and execution
- The application starts as an x86 or x64 process under the appropriate Windows compatibility layer.
- When execution reaches code that has not yet been translated, the emulator analyzes a block of the original instructions.
- It emits equivalent Arm64 instructions and performs optimization intended to make that generated code more efficient.
- The Arm64 processor executes the translated block while Windows tracks the relationship between the original and generated code.
The first encounter with a code path can therefore include translation work. Frequently used paths benefit when their translated versions are reused instead of being generated again.
Translated-code caching
Windows maintains a service that caches translated blocks. Microsoft says caches are produced per module and can be reused by other applications on their first launch. This reduces repeated translation overhead for shared components and helps explain why an application may feel slower during an initial run, update or cache rebuild than it does later.
Caching is not the same as converting the entire application permanently into a native Arm program. The emulator still has to handle code that changes, newly installed modules and execution paths that were not previously cached. Cache behavior can also be affected by application updates and by per-application emulation settings.
What Prism changes in Windows 11 24H2
Windows 11 version 24H2 introduced Prism, a newer emulator intended to improve performance and reduce CPU use compared with earlier Windows on Arm emulation technology. Prism is available on supported Windows 11 24H2 Arm devices more broadly, while some of its performance features require hardware capabilities found only in Qualcomm Snapdragon X-series processors. Microsoft describes Prism as tuned for Snapdragon processors; that does not mean every Arm laptop receives identical results.
Prism also supports additional emulated CPU features in Windows 11 24H2 and later, including AVX, AVX2, BMI, FMA and F16C. An application-specific setting can hide those features when reproducing behavior from an earlier environment is necessary.
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Does emulation make apps slower?
Usually, translation introduces some overhead compared with executing a native Arm64 build, but there is no single slowdown percentage that applies to every application. Microsoft’s documentation does not establish a universal penalty or claim that emulated execution is equivalent to native execution in all workloads.
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| Workload or condition | Why results can differ |
|---|---|
| Light office work | Short bursts of computation and frequent use of shared, cached components may make translation overhead less noticeable. |
| Long CPU-bound calculations | More instructions must be translated or executed, so architecture and processor differences matter more. |
| Graphics-heavy software | Results depend on the Arm graphics driver, the application’s rendering path and any native or emulated plug-ins. |
| Older or unusual code | Self-modifying code, dynamic code generation and unsupported assumptions can create compatibility or performance problems. |
| First launch or after an update | Translation and cache creation can add work before reusable translated blocks are available. |
Battery behavior also varies with workload. Microsoft’s Surface documentation states that workload affects battery life; an emulated application that keeps the CPU busy can have a different power profile from a native Arm64 build doing the same job.
How to compare two versions fairly
Compare the same application and workload on the same Windows release, then identify whether each build is native Arm64, pure emulated x86 or x64, or a hybrid Arm64EC/x64 process. Record the processor model, application version, plug-ins, drivers and emulation settings. A benchmark from one processor or one release cannot establish how every Windows on Arm device will behave.
Compatibility limits beyond the main executable
Drivers and kernel components
Windows does not emulate kernel-mode drivers. Any feature that depends on a driver requires an Arm64-compatible driver supplied by the hardware or software vendor. This is a common reason an application appears to install and launch but cannot access a device or protected system function.
DLL-injecting extensions and shell integrations
Extensions that load DLLs into Windows processes, including shell extensions, need binaries that match the architecture of the process they enter. A file-management extension or context-menu handler can therefore break even when the associated desktop program itself runs under emulation.
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Dynamic code generation
Microsoft’s troubleshooting guidance identifies restrictions on dynamic code generation as a possible reason an x86 desktop application will not run. Software that creates executable code at runtime, uses unusual just-in-time techniques or depends on self-modifying behavior may need an update from its developer or a different configuration.
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Filesystem and registry behavior
The x86 WOW64 layer provides filesystem and registry redirection so that many 32-bit applications see the locations and settings expected by their original design. x64 applications on Windows 11 on Arm use a different arrangement: Microsoft describes no separate WOW64 layer and no separate folder containing only x64 system binaries. Arm64X system binaries can be loaded by both Arm64 and x64-compatible processes.
Adjusting emulation for one application
Windows exposes optional per-application controls when the default balance between compatibility and speed is not suitable. Microsoft’s defaults are intended to work for most programs. Overrides can improve compatibility in a specific case, but stricter behavior can reduce performance, cause crashes or prevent an application from launching.
Open the settings
- Locate the application’s executable file or its shortcut.
- Open Properties.
- Select the Compatibility or emulation-related settings supplied for that executable, depending on the Windows build.
- Change one option at a time, apply it and test the application with a repeatable task.
- Record the original values so you can restore the Windows defaults if the change makes the problem worse.
Settings you may encounter
- Multi-core operation: controls how emulated execution uses multiple processor cores.
- Translated-code cache behavior: changes how cached translated blocks are used or regenerated.
- x86 hybrid execution: changes how selected x86 code paths are handled.
- Self-modifying code: provides compatibility behavior for software that changes its own executable code.
- RWX-page optimization: affects handling of memory pages that are both writable and executable.
- Floating-point precision: can help software that relies on particular floating-point behavior.
- Emulated CPU feature visibility: in Windows 11 24H2 and later, can hide AVX, AVX2, BMI, FMA or F16C from an application to reproduce earlier CPU feature behavior.
Do not enable every override at once. If a change causes a crash or stops launch, return to the defaults, then test a single compatibility option with the application’s vendor guidance.
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A complete rewrite is not the only migration path. Arm64EC lets developers compile selected parts of a Windows 11 application for native Arm64 execution while leaving other x64 components under the emulation built into Windows.
How Arm64EC processes are composed
Arm64EC code in the process runs with native performance, while x64 code continues to run through Windows 11 emulation. The two can interoperate in the same process, allowing a team to begin with the modules that matter most for startup time or sustained CPU use.
An Arm64EC process can use Arm64EC dependencies or x64 dependencies. Ordinary Arm64 dependencies cannot be used in that same mixed-process arrangement, so library selection and build configuration must be planned carefully.
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An incremental migration sequence
- Inventory the application’s executable, libraries, plug-ins, drivers and third-party dependencies.
- Measure which modules consume the most CPU time in real workloads.
- Port the most expensive application modules or dependencies to Arm64EC first.
- Keep compatible x64 components in the process while validating behavior and installer changes.
- Replace remaining x64 components when their dependencies and testing are ready.
- Build separate Arm64 versions for components that must run as native Arm64 or outside the Arm64EC process.
This approach can capture native performance where it matters without requiring every dependency to be rebuilt simultaneously.
A practical checklist before buying or deploying an Arm Windows PC
- Confirm whether the required Windows edition is Windows 11. Windows 10 on Arm does not emulate x64 applications.
- Check whether the application has a native Arm64 or Arm64EC build.
- List every driver, plug-in, shell extension, codec and security component the workflow needs.
- Identify whether the workload is mostly light interactive work or sustained CPU computation.
- For Windows 11 24H2, verify the device’s processor and whether the relevant Prism hardware features are present; Snapdragon X-series support is not a guarantee of identical results across models.
- Test the exact application version and data set before organization-wide deployment.
- Plan a fallback for hardware or software that requires an Arm64 driver.
What to do when an emulated app fails
- Install the latest supported Windows updates and the application version, then retest with default emulation settings.
- Check whether the failure involves a driver, service or shell extension rather than the main executable.
- Ask the component vendor for an Arm64 build if a kernel-mode or injected DLL component is involved.
- Review whether the application uses dynamic code generation, self-modifying code or a CPU feature that it incorrectly assumes is present.
- Try one documented per-app setting, change only one variable at a time and keep a record of the result.
- If no compatible component exists, use a native Arm alternative or run the workload on an x86-64 Windows system.
An application that launches is not necessarily fully compatible. Validate the functions that matter—device access, printing, plug-ins, file associations, updates and background services—rather than stopping at the first successful start.
Key takeaways
- Windows 11 on Arm emulates both x86 and x64 user-mode applications; Windows 10 on Arm emulates x86 only.
- Translation works on instruction blocks, with optimized Arm64 code and a cache that reduces repeated translation.
- Prism in Windows 11 24H2 improves the emulation technology, but performance still depends on workload, processor, software version and hardware capabilities.
- Drivers are not emulated, and architecture-specific extensions can remain incompatible.
- Per-app settings can solve particular compatibility cases, but may reduce speed or stability.
- Arm64EC gives developers a staged route to native performance while x64 code remains emulated in the same Windows 11 process.
Frequently Asked Questions
Can Windows 11 on Arm run x64 desktop apps?
Yes. Windows 11 on Arm includes x64 user-mode emulation as well as x86 emulation. Windows 10 on Arm supports x86 emulation but not x64 emulation.
Are emulated apps always slower than native Arm apps?
Translation adds overhead in principle, but the size of the difference depends on the workload, processor, application and Windows version. The available Microsoft documentation does not establish one universal slowdown percentage.
Why does an app launch but its hardware feature fail?
The main program may be emulated successfully while a required kernel-mode driver is not. Drivers must be compiled for Arm64; shell extensions and injected DLLs may also need architecture-matched builds.
What is Arm64EC used for?
Arm64EC lets native Arm64EC code and emulated x64 code run in the same Windows 11 process. Developers can port high-impact modules first instead of rebuilding the entire application at once.
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