South Korea’s LG Electronics on Thursday unveiled the LG Optimus 2X, a smartphone with a dual-core processor. LG Optimus 2X This uses Nvidia’s Tegra 2 processor, making for faster, smoother Web browsing and a better multitasking experience, LG said. The Optimus 2X will be released with Android 2.2; it will be upgradable to Android 2.3…