Explore the intricacies of compiling to JavaScript in this 27-minute JSConf talk by Florian Loitsch. Dive into the world of dart2js, a Dart-to-JavaScript compiler, and discover various optimization techniques that can be applied to languages targeting JavaScript as a compilation target. Learn about tree-shaking, speculative optimizations, and local SSA-based optimizations. Gain valuable insights into making JavaScript compilation faster and more efficient, applicable to a wide range of programming languages beyond Dart.