diff --git a/config/mainnet.json b/config/mainnet.json
index eb96791c..27bd3b5b 100644
--- a/config/mainnet.json
+++ b/config/mainnet.json
@@ -1,6 +1,6 @@
 {
     "logs": {
-        "level": "warn"
+        "level": "info"
     },
     "blockchain": {
         "rpc": "https://rpc.tomochain.com",
diff --git a/config/mainnet_crawler.json b/config/mainnet_crawler.json
index 3a49ffcb..e8588661 100644
--- a/config/mainnet_crawler.json
+++ b/config/mainnet_crawler.json
@@ -1,6 +1,6 @@
 {
     "logs": {
-        "level": "warn"
+        "level": "info"
     },
     "blockchain": {
         "rpc": "http://blockchain-proxy:8545",
diff --git a/crawl.js b/crawl.js
index 7f2d429e..1915315c 100644
--- a/crawl.js
+++ b/crawl.js
@@ -250,17 +250,21 @@ async function updateSigners () {
 
 let sleep = (time) => new Promise((resolve) => setTimeout(resolve, time))
 async function watchNewBlock () {
+    let b = true
     while (true) {
         try {
-            logger.info('Update signers after sleeping 5 seconds')
-            await updateSigners()
-            await updatePenalties()
+            logger.info('Update signers after sleeping 3 seconds')
+            if (b) {
+                await updateSigners()
+                await updatePenalties()
+            }
             await updateLatestSignedBlock()
             await watchValidator()
+            b = !b
         } catch (e) {
             logger.error('watchNewBlock %s', e)
         }
-        await sleep(5000)
+        await sleep(3000)
     }
 }