[Best Practices: Benchmarking Service Mesh Performance](https://istio.io/latest/blog/2019/performance-best-practices/) > At 1000 requests per second (RPS), across 16 connections, Istio adds 3 milliseconds per request in the 50th percentile, and 10 milliseconds in the 99th percentile. Istio 1.2ではsidecar proxyのレイテンシオーバヘッドは，16接続，1,000 RPSで，50%tileが3ms，99%tileが10ms．もちろん，リクエスト経路の遷移が深くなるほど，オーバヘッドは積み重なる． [Performance and Scalability](https://istio.io/latest/docs/ops/deployment/performance-and-scalability/) こちらは，1.9.1の話．90%tileが2.65 ms．