Microsoft has added an Advanced Performance Extensions setting to Windows 11, giving the operating system a way to expose Intel's APX feature on hardware that supports it. The toggle appears in Windows 11 build 29295, which is an Insider build, and would show up only on compatible machines. For now, switching it on has no practical effect.
That is because no APX-capable processors are on sale yet. Intel first announced APX in 2023. The extension adds 16 general-purpose registers, bringing the total from 16 to 32, and introduces three-operand instruction formats with a new data destination register for many integer instructions. Intel has said code compiled with APX can run with 10 percent fewer loads and 20 percent fewer stores than the Intel 64 baseline.
Software support has been building for roughly two years. APX has shipped in the GCC compiler since version 14, and later releases up to GCC 17, which is aiming for a 2027 code freeze, have continued to add support. LLVM and MSVC carry preliminary support. Developers still must recompile their applications with the correct flags for APX-capable CPUs before those instructions can be used.
The first chips expected to include APX are Intel's Nova Lake Core Ultra 400-series processors, which are not due until early 2027. The 28-core version is expected to arrive first, with a 52-core model following later in the year. Intel's Xeon 7, codenamed Diamond Rapids, is also slated to bring APX support to the data center in 2027, with up to 256 cores.
Microsoft's move does not mean users need to plan a hardware purchase immediately. The setting is in place ahead of the silicon, and the performance benefit depends on applications being rebuilt for the new instructions. The Windows 11 toggle alone will not change how existing software runs.
The APX setting arrives as Microsoft continues adjusting Windows 11 performance in other areas. Five years after the operating system launched, Microsoft has said it is working to improve how Windows 11 runs on machines with 8GB of RAM. Separately, an expansion of the Windows 11 Memory Integrity feature is set to reduce gaming performance on some systems.
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