Every modern PC and Laptop is based on a SoC, since the CPU contains at least the chipset, if not the GPU and even RAM, too. The performance isn't the problem of SoCs, but of ARM vs x86. At the moment, an ARM core just isn't nowhere near the performance of a x86 core. Not only, because of the architectual differences, but also because of better optimized compilers, tools and libraries on the x86 platform. But, of course, there is (to my knowledge) no free x86 chip out there, and both AMDs and Intels CPUs have undocumented firmware inside, which are a huge security nightmare. (All Intel processors actually run a custom MINIX inside of them, which probably makes it the most installed OS in the world=