diff --git a/tm-bench/main.go b/tm-bench/main.go
index 6bbe4f22..844c14df 100644
--- a/tm-bench/main.go
+++ b/tm-bench/main.go
@@ -102,7 +102,7 @@ Examples:
 		timeStop := time.Now()
 		logger.Info("Time stopped", "t", timeStop)
 
-		stats := calculateStatistics(client, minHeight, timeStart, timeStop)
+		stats := calculateStatistics(client, minHeight, timeStart, timeStop, duration)
 
 		printStatistics(stats, outputFormat)
 
@@ -119,7 +119,7 @@ func latestBlockHeight(client tmrpc.Client) int64 {
 	return status.SyncInfo.LatestBlockHeight
 }
 
-func calculateStatistics(client tmrpc.Client, minHeight int64, timeStart, timeStop time.Time) *statistics {
+func calculateStatistics(client tmrpc.Client, minHeight int64, timeStart, timeStop time.Time, duration int) *statistics {
 	stats := &statistics{
 		BlocksThroughput: metrics.NewHistogram(metrics.NewUniformSample(1000)),
 		TxsThroughput:    metrics.NewHistogram(metrics.NewUniformSample(1000)),
@@ -134,7 +134,18 @@ func calculateStatistics(client tmrpc.Client, minHeight int64, timeStart, timeSt
 
 	numBlocksPerSec := make(map[int64]int64)
 	numTxsPerSec := make(map[int64]int64)
+	// because during some seconds blocks won't be created...
+	for i := int64(0); i < int64(duration); i++ {
+		numBlocksPerSec[i] = 0
+		numTxsPerSec[i] = 0
+	}
+
 	for _, blockMeta := range info.BlockMetas {
+		// check if block was created after timeStart
+		if blockMeta.Header.Time.Before(timeStart) {
+			continue
+		}
+
 		// check if block was created before timeStop
 		if blockMeta.Header.Time.After(timeStop) {
 			break
diff --git a/tm-bench/transacter.go b/tm-bench/transacter.go
index d5316d9f..89a18b5f 100644
--- a/tm-bench/transacter.go
+++ b/tm-bench/transacter.go
@@ -168,7 +168,7 @@ func (t *transacter) sendLoop(connIndex int) {
 					Params:  rawParamsJSON,
 				})
 				if err != nil {
-					fmt.Printf("%v. Try reducing the connections count and increasing the rate.\n", errors.Wrap(err, "txs send failed"))
+					fmt.Fprintf(os.Stderr, "%v. Try reducing the connections count and increasing the rate.\n", errors.Wrap(err, "txs send failed"))
 					os.Exit(1)
 				}
 
@@ -176,7 +176,9 @@ func (t *transacter) sendLoop(connIndex int) {
 			}
 
 			timeToSend := time.Now().Sub(startTime)
-			time.Sleep(time.Second - timeToSend)
+			if timeToSend < 1*time.Second {
+				time.Sleep(time.Second - timeToSend)
+			}
 			logger.Info(fmt.Sprintf("sent %d transactions", t.Rate), "took", timeToSend)
 		case <-pingsTicker.C:
 			// go-rpc server closes the connection in the absence of pings