The latest Go release, version 1.3, arrives six months after 1.2, and contains no language changes. It focuses primarily on implementation work, providing precise garbage collection, a major refactoring of the compiler tool chain that results in faster builds, especially for large projects, significant performance improvements across the board, and support for DragonFly BSD, Solaris, Plan 9 and Google’s Native Client architecture (NaCl). It also has an important refinement to the memory model regarding synchronization.