JIT On vs JIT Off: PHP 8.5 JIT Performance Under I/O Latency (2026)
In our previous benchmarks, we kept JIT disabled to isolate the impact of runtime architecture on performance. Readers immediately asked: “What happens when you turn JIT on?” Today, we answer that question definitively—by re-running our comprehensive four-environment, three-tier I/O latency test with PHP 8.5’s JIT compiler fully enabled. The results are surprising. JIT not only failed … Read more