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Benchmarking Windows 11 Prism Binary Translation: Performance Loss of x86-64 Programs on Arm
Chips and Cheese author Chester Lam used Geekbench 7 to benchmark Windows 11's Prism binary translation, finding that x86-64 programs execute roughly twice as many aarch64 instructions after translation as they would natively, with performance losses of several generations across all cores. Testing was conducted on a Snapdragon X2 Elite Extreme X2E-96-100 laptop and on Neoverse N1 and N2 instances on Azure; even after bearing the translation losses, the Snapdragon's E-Cores and P-Cores still respectively outperformed the Neoverse N1 and N2. The author also examined the translated code in C:\Windows\XtaCache, noting that Prism performs unnecessary register spills and splits 256-bit AVX operations into multiple 128-bit NEON instructions.
ughly twice as many aarch64 instructions after translation as they would natively, with performance losses of several generations across all cores. Testing was conducted on a Snapdragon X2 Elite Extreme X2E-96-100 laptop and on Neoverse N1 and N2 instances on Azure; even after bearing the translation losses, the Snapdragon's E-Cores and P-Cores still respectively outperformed the Neoverse N1 and N2. The author also examined the translated code in C:\Windows\XtaCache, noting that Prism performs u
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Chester Lam reviews Prism binary translation performance loss
Chips and Cheese author Chester Lam published a review on September 10, 2026, using Geekbench 7 to benchmark Windows 11's Prism binary translation, examining the performance loss of x86-64 programs on the Arm platform. Tests showed that x86-64 programs executed roughly twice as many aarch64 instructions after translation as native code, with every core showing performance losses of several generations. Testing was conducted on a Snapdragon X2 Elite Extreme X2E-96-100 laptop and on Neoverse N1 and N2 instances on Azure; even while bearing the translation loss, the Snapdragon's E-Cores and P-Cores still respectively outperformed Neoverse N1 and N2. The author also examined the translated code in C:\Windows\XtaCache, noting that Prism performs unnecessary register spills and splits 256-bit AVX operations into multiple 128-bit NEON instructions. This review is currently a single-source report with no subsequent developments.
ted roughly twice as many aarch64 instructions after translation as native code, with every core showing performance losses of several generations. Testing was conducted on a Snapdragon X2 Elite Extreme X2E-96-100 laptop and on Neoverse N1 and N2 instances on Azure; even while bearing the translation loss, the Snapdragon's E-Cores and P-Cores still respectively outperformed Neoverse N1 and N2. The author also examined the translated code in C:\Windows\XtaCache, noting that Prism performs unneces
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