Intel CPU Security Mitigation Costs From Haswell Through Panther Lake

Written by Michael Larabel in Processors on 12 March 2026 at 11:50 AM EDT. Page 2 of 8. 16 Comments.

👁 Selenium benchmark with settings of Benchmark: Speedometer 3.1, Browser: Google Chrome. Ultra X7 358H: Defaults was the fastest.

👁 Selenium benchmark with settings of Benchmark: Jetstream 2, Browser: Firefox. Ultra X7 358H: mitigations=off was the fastest.

👁 Selenium benchmark with settings of Benchmark: StyleBench, Browser: Google Chrome. Ultra X7 358H: mitigations=off was the fastest.

👁 Selenium benchmark with settings of Benchmark: WASM collisionDetection, Browser: Firefox. Ultra X7 358H: Defaults was the fastest.

👁 Selenium benchmark with settings of Benchmark: WASM collisionDetection, Browser: Google Chrome. Ultra X7 358H: mitigations=off was the fastest.

👁 Selenium benchmark with settings of Benchmark: WASM imageConvolute, Browser: Firefox. Ultra X7 358H: mitigations=off was the fastest.

👁 Selenium benchmark with settings of Benchmark: WASM imageConvolute, Browser: Google Chrome. Ultra X7 358H: mitigations=off was the fastest.

👁 Selenium benchmark with settings of Benchmark: Kraken, Browser: Google Chrome. Ultra X7 358H: mitigations=off was the fastest.

When looking at the Firefox and Google Chrome web browser performance impact of running Panther Lake in "mitigations=off" mode, there was very little difference. The performance impact of the few relevant mitigations still in place for the Cougar Cove and Darkmont cores was very minor for the web browser performance.

👁 Timed Linux Kernel Compilation benchmark with settings of Build: defconfig. Ultra X7 358H: mitigations=off was the fastest.

👁 Timed Godot Game Engine Compilation benchmark with settings of Time To Compile. Ultra X7 358H: mitigations=off was the fastest.

👁 Timed LLVM Compilation benchmark with settings of Build System: Ninja. Ultra X7 358H: mitigations=off was the fastest.

With older generations of CPUs, mitigations=off was able to provide a nice speed-up for code compilation / software build times but with Panther Lake running in the mitigations=off mode contributed very little to speeding up the software compilation speed on these latest generation Intel CPU cores.

👁 RawTherapee benchmark with settings of Total Benchmark Time. Ultra X7 358H: mitigations=off was the fastest.

Surprisingly one workload where there still was a measurable performance difference to mitigtions=off on Panther Lake was for thw RawTherapee RAW photography software.

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⇱ Intel CPU Security Mitigation Costs From Haswell Through Panther Lake Review - Phoronix

Intel CPU Security Mitigation Costs From Haswell Through Panther Lake