I/O architecture determines scale: One large read instead of thousands of small reads changed everything Profiler-driven optimization: 90% of allocations and 70% of CPU were hiding in unexpected places Distributed redesign unlocks speed: Map-reduce Lambda architecture delivered 6x indexing speedup Compound optimizations multiply: Each optimization amplified others to reach 673 billion rows/second Production beats theory: V0's elegant design failed; V1 succeeded by respecting network physics Near...