In programming users usually don't see or care about what's going on on the inside all that much. All those boring code optimizations may make things easier for the developers and slowly improve the emulator, but hard-to-quantify changes are not exactly exciting. This month was full of those, with several hundred changes yet very little the general user would find interesting. Nevertheless, in the sea of code improvement, there are some real treasures: big performance improvements, some ancient bugs squashed, regression fixes, and some exciting new features to boot.