- Windows 11 build 29695.1001 introduces an experimental Advanced Performance Extensions (APX) toggle.
- Intel APX doubles general-purpose processor registers from 16 to 32 and can reduce the number of instructions needed by compatible software.
- APX requires compatible processors and software, so a system update cannot add support to existing incompatible CPUs.
- Microsoft hasn’t confirmed a public release date or whether APX will ship with Windows 11 27H2.
Microsoft is testing support for Intel’s Advanced Performance Extensions (APX) on Windows 11, a processor technology designed to improve performance by letting compatible software run instructions more efficiently.
The new Advanced Performance Extensions toggle appeared on Windows 11 build 29695.1001, released to the Experimental (Future Platforms) channel on October 23, 2026. The setting is described as “Let Windows use APX for better performance” and prompts users to restart their computers after enabling it.
Windows enthusiast Xeno discovered the option and shared a screenshot on X. However, the setting remains experimental, and its appearance doesn’t confirm that APX is working or delivering measurable performance gains.
Microsoft has not announced when the feature will become available to the public or confirmed whether it’ll ship with a specific release of the operating system.
What is Intel APX, and how does it improve performance?
Intel introduced Advanced Performance Extensions in 2023 to expand the x86-64 instruction set with new capabilities designed to improve processor performance without significantly increasing power consumption or chip size.
One of APX’s biggest changes is doubling the number of general-purpose registers from 16 to 32. Registers are small, high-speed storage locations inside a processor that hold values needed to execute instructions.
The ability to have more registers lets software keep more data close to the processor instead of repeatedly moving values between registers and system memory. This can reduce unnecessary operations and help apps execute more efficiently.
APX also introduces new instructions that can reduce register transfers, avoid unnecessary processor status updates, and improve how software handles conditional branches.
According to Intel’s estimates, code compiled to use APX can have 10 percent fewer load operations, more than 20 percent fewer store operations, and 10 percent fewer instructions than comparable code compiled for the existing Intel 64 architecture.
These figures describe changes in compiled code, not a guaranteed improvement in overall system performance. They don’t mean Windows 11 or every application will run 10 to 20 percent faster.
How to enable APX in Windows 11
Microsoft is testing the Advanced Performance Extensions setting on Windows 11 build 29695.1001. If you’re running a build that exposes the option, you can find it in the Settings app under System > Advanced > For developers.
The toggle is labeled “Advanced Performance Extensions (APX)” and includes the description “Let Windows use APX for better performance.” Turn on the option and restart your computer when prompted to apply the change.
However, this is an experimental setting, and it may not appear on every Insider installation. You also need a processor that supports APX to benefit from the technology. Enabling the toggle doesn’t add APX capabilities to incompatible processors or automatically optimize every application.
Why does APX appear under For developers?
The APX setting appears under “For developers” because Microsoft is testing a low-level processor capability that requires coordinated support from the operating system, development tools, and compatible software.
APX is not a conventional performance switch that automatically speeds up every application. Developers need compatible compilers and software that can use the new processor instructions, while the operating system must support the technology correctly.
Placing the option here makes sense during development because it exposes an experimental control to test APX before a broader release. However, Microsoft hasn’t explained why it chose this location or confirmed whether the setting will stay there.
The location also doesn’t mean APX will be exclusive to developers. If Microsoft eventually releases the feature for general use, the company could change where the setting appears or how Windows manages APX support.
Windows 11 needs compatible hardware and software
Although the company is testing APX support on Windows 11, a software update can’t add the necessary processor capabilities to existing computers.
The processor must support APX, and apps need to use the new instructions to benefit from the technology. Intel says developers can generally enable APX through recompilation without changing their source code, provided they use compatible compilers and supporting software.
This means APX will not automatically accelerate every application after Microsoft enables the feature. Actual gains will depend on the processor, app, workload, and how the software uses the new instructions.
Intel’s upcoming Nova Lake processor family is expected to support APX, making it a potential candidate for the first consumer devices to benefit once Windows 11 and apps support the technology. Intel has also described the APX support for its Diamond Rapids server processors.
AMD has discussed APX as part of its collaboration with Intel on the x86 architecture, but it hasn’t specified which AMD processors will support the feature or when it might become available.
Could APX arrive with Windows 11 27H2?
Microsoft is testing the setting in its Rubidium-based Future Platforms development branch, which could provide groundwork for a future Windows release, potentially Windows 11 27H2.
However, the Experimental (Future Platforms) channel is not tied to a specific Windows version. Features in these builds can change, be removed, or never reach a public release.
For now, APX’s appearance shows that the company is exploring support for the technology, not confirming a release schedule.
Existing PCs can still benefit from performance improvements
APX is different from Windows 11’s Low Latency Profile, which improves the responsiveness of parts of the interface and application launches without requiring a new processor instruction set.
Microsoft has expanded Low Latency Profile support to application launches, and testing on existing devices shows some apps can open faster with the optimization enabled.
APX could offer another avenue for improving performance on future compatible hardware, but its real-world impact remains to be seen.
For now, Microsoft has not published benchmarks for its APX implementation or confirmed when the setting will reach stable Windows 11 releases. The technology is promising, but its presence in an experimental build doesn’t guarantee a noticeable performance boost for everyday users.
Mauro Huculak is a Windows How-To Expert and founder of Pureinfotech in 2010. With over 23 years as a technology writer and IT Specialist, Mauro specializes in Windows, software, and cross-platform systems such as Linux, Android, and macOS.
Certifications: Microsoft Certified Solutions Associate (MCSA), Cisco Certified Network Professional (CCNP), VMware Certified Professional (VCP), and CompTIA A+ and Network+.
Mauro is a recognized Microsoft MVP and has also been a long-time contributor to Windows Central.
You can follow him on YouTube, Threads, BlueSky, X (Twitter), LinkedIn and About.me. Email him at [email protected].
