Linux-oriented tech website Phoronix tested Intel's latest OpenGL driver for Linux. The site compared the performance of the Intel HD 3000 and HD 4000 integrated graphics on Ubuntu 12.10, Kubuntu 12.10 and Windows 7, and the results show that the Linux driver is still much slower than the Windows version.
Kubuntu seems generally faster than Ubuntu, but the difference with Windows is very large, in some tests the Linux distros don't even deliver half the performance of the Windows driver.
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To no real surprise, the Intel Linux OpenGL performance is still sub-par compared to the Intel Windows driver. The Intel Windows driver is in better shape but at least the Intel OTC developers have been making great progress in recent years in terms of slowly but surely catching up on OpenGL compliance, display and 3D features, and more timely hardware support. Intel is planning more OpenGL Linux performance improvements going into next year. Haswell and Valley View Linux preparations are also well underway.