some performance results of envoy's different versions

I did some simple tests today and found that envoy's performance seems to be getting worse and worse. Although I know features should always come at some cost. But those costs seem to be too much.

And although I know that performance is not the first goal of Envoy. But with continuous enhancement of Envoy, the performance seems to degrade too quickly. Here are some simple results of single envoy worker:

Version	QPS
v1.12.4	26921.48
v1.13.3	25182.18
v1.14.7	23732.31
v1.15.5	21010.66
v1.16.5	19116.81
v1.17.4	17804.78
v1.18.4	16953.67
v1.19.1	16046.59
v1.20.0	15949.65

I think we should at least prevent it from further deterioration, and at the same time find ways to optimize it.

Here is my config yaml:

static_resources:
  listeners:
    - address:
        socket_address:
          address: 0.0.0.0
          port_value: 9090
      filter_chains:
        - filters:
            - name: envoy.http_connection_manager
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
                codec_type: auto
                stat_prefix: ingress_http
                route_config:
                  name: local_route
                  virtual_hosts:
                    - name: host-one # prefix route
                      domains:
                        - "*"
                      routes:
                        - match:
                            prefix: "/"
                          route:
                            cluster: httpbin
                http_filters:
                  - name: envoy.router
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
                      dynamic_stats: false
                      suppress_envoy_headers: true
  clusters:
    - name: httpbin
      connect_timeout: 5s
      type: strict_dns
      lb_policy: round_robin
      load_assignment:
        cluster_name: httpbin
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address:
                      address: localhost
                      port_value: 8080

admin:
  access_log_path: "/dev/null"
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 20000

Back-end: multi-processes Nginx that will return simple short string.

Client command: wrk -c 200 -t 2 -d 180s http://localhost:9090/