How V8 Turns Your JavaScript Into Machine Code: The Four-Tier Compilation Revolution
When Google released Chrome in 2008, its JavaScript performance was revolutionary. The secret was V8, an engine that compiled JavaScript directly to machine code rather than interpreting it. But the V8 of 2026 bears almost no resemblance to that original design. Four compilation tiers, speculative optimization based on runtime feedback, and a constant battle between compilation speed and execution speed have transformed JavaScript from a “slow scripting language” into something that routinely outperforms carefully optimized C++ for many workloads. ...