Vibe coders don't understand concepts such as: indexing, caching, deduping, memoization, profiling, Big O, N+1 queries, lazy loading, connection pooling, pagination, re-render management, layout thrashing, virtualization, debouncing, code splitting, memory leaks, garbage collection, streaming vs. buffering, async parallelism, main thread blocking, race conditions, backpressure, request waterfalls, payload optimization, batching, round-trip costs, cache invalidation, hot path analysis, data structure selection, and countless other concepts related to performance."