diff --git a/godns.conf b/godns.conf
index a6e7bbc..0b7fda7 100644
--- a/godns.conf
+++ b/godns.conf
@@ -14,6 +14,9 @@ port = 53
 [resolv]
 resolv-file = "/etc/resolv.conf"
 timeout = 5  # 5 seconds
+# The concurrency interval request upstream recursive server
+# Match the PR15, https://github.com/kenshinx/godns/pull/15
+interval = 200 # 200 milliseconds
 
 [redis]
 host = "127.0.0.1"
diff --git a/resolver.go b/resolver.go
index 6649b50..cc59dcd 100644
--- a/resolver.go
+++ b/resolver.go
@@ -56,7 +56,7 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 		}
 	}
 
-	ticker := time.NewTicker(time.Second)
+	ticker := time.NewTicker(time.Duration(settings.ResolvConfig.Interval) * time.Millisecond)
 	defer ticker.Stop()
 	// Start lookup on each nameserver top-down, in every second
 	for _, nameserver := range r.Nameservers() {
diff --git a/settings.go b/settings.go
index 9a3de78..46108bc 100644
--- a/settings.go
+++ b/settings.go
@@ -27,6 +27,7 @@ type Settings struct {
 type ResolvSettings struct {
 	ResolvFile string `toml:"resolv-file"`
 	Timeout    int
+	Interval   int
 }
 
 type DNSServerSettings struct {