The upcoming Windows 10 November update will enable a feature of Intel's Skylake processor that should increase its performance up to 26%. The feature is called Speed Shift and with the upcoming Windows 10 update it will be supported for the first time.
Without Speed Shift the operating system has control over the dynamic adjustment of voltages and frequencies but can also set them to so called P-States which are set during production. With Speed Shift enabled, the CPU takes control over these parameters which allows much finer control. It allows the CPU to reach maximum power only when really required and will also restore power saving mode more quickly.
Speed Shift was introduced with Skylake processors but wasn't supported by Windows so far. Windows 10 will be the first OS to support it. AnandTech has played with a pre-release of Windows 10 (Windows Insider build 10586 should also have it) that has Speed Shift enabled and reports improvements in performance and power consumption. The PCMark Home and Work benchmarks show a neglectable difference.
Google's Octane 2.0, WebXPRT 2015 and WebXPRT 2013 showed performance gains of 4%, 20% and 26% respectively.
