Increase max idle connections from 100 to 4096 (#6244)

This is to be inline with our benchmarking results

cmd/rpc/client.go

@@ -116,11 +116,13 @@ func NewClient(serviceURL *xnet.URL, tlsConfig *tls.Config, timeout time.Duratio
 			Transport: &http.Transport{
 				Proxy:                 http.ProxyFromEnvironment,
 				DialContext:           newCustomDialContext(timeout),
-				MaxIdleConns:          100,
+				MaxIdleConnsPerHost:   4096,
+				MaxIdleConns:          4096,
 				IdleConnTimeout:       90 * time.Second,
 				TLSHandshakeTimeout:   10 * time.Second,
 				ExpectContinueTimeout: 1 * time.Second,
 				TLSClientConfig:       tlsConfig,
+				DisableCompression:    true,
 			},
 		},
 		serviceURL: serviceURL,