Istio Latency issues

We have recently started to migrate our applications to use Istio instead of Nginx, but the latency we are seeing is much higher than what’s claimed in istio documentation, approx ~20ms is added to 95th percentile while running the load tests simultaneously on the application using via istio vs nginx. MTLS is disabled. Istiod and sidecar are assigned enough resources as well. Any ideas why the latency is so high?