Performance boost is coming: Windows 11 receives support for Intel APX
More speed for 64-bit apps: Microsoft is incorporating Intel’s new instruction set extension APX into Windows 11. In the latest insider preview, the performance booster can already be activated with a switch – this should make PCs noticeably more efficient.
Support for Intel’s APX instruction set extension
Like the well-known Windows insider Xeno on the Platform X documented, the function appeared in the current preview version with build number 29695. There, developers can activate the technology using a simple switch that says that Windows can use APX for better performance. After flipping the switch, the system will require a reboot to apply the change. Intel first introduced the Advanced Performance Extensions (APX) in July 2023 to fundamentally accelerate the existing 64-bit architecture. The chip manufacturer only published it in August 2026 ninth version of the architecture specificationafter the full range of functions had already been activated in the GCC 15 compiler. This means that programmers can now adapt their software for corresponding processors, while Microsoft now supplies the appropriate counterpart in the operating system.
What the new instruction set extension does
The most important innovation in APX is the doubling of the so-called general-purpose registers (GPRs) from 16 to 32. This allows the processor to store significantly more data directly in its fast registers instead of repeatedly accessing the main memory in a time-consuming manner. According to Intel’s own simulations using the SPEC CPU 2017 Integer benchmark suite – the established standard for measuring processor performance per clock cycle – program code translated for APX requires around ten percent fewer loads and over 20 percent fewer writes. Overall, the number of commands to be executed drops by around ten percent.
Additionally, APX introduces new three-operand instructions with a separate destination register (NDD), eliminating unnecessary data movement between registers. New conditional load, store and compare instructions help compilers reduce program branches, while the No Flags (NF) feature prevents unnecessary status flag updates. Both measures reduce performance losses caused by incorrect processor branch predictions. Rounding out the package are PUSH2 and POP2 instructions for faster register backup and restore, as well as a new direct 64-bit jump instruction.
Outlook for the upcoming function update
It will take some time before the technology reaches all users. Microsoft is currently testing APX support on the new Rubidium codebase, which is expected to form the foundation for the future Windows 11 27H2 feature update. After the current version of Windows 11 26H2 has already brought noticeable speed advantages, Microsoft is continuing its focus on more system performance in the next major generation of Windows.
Amit Gohar is Technical writer at ResearchSnipers.com, he is well versed Technology News writer, he has completed is MS computer Science in 2020. He can be reached at amit.g@researchsnipers.com
