diff --git a/README.md b/README.md
index 8536a3a..e60ec78 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,8 @@ Usage: rvcmd [-notrs] [-dns dns.yaml] 'target/to/download'
   -f    force download even file exists
   -notrs
         use standard TLS client
+  -notui
+        use plain text instead of TUI
   -w uint
         connection waiting seconds (default 4)
   'target/to/download'
diff --git a/README_sc.md b/README_sc.md
index 1ab18fc..efdf83c 100644
--- a/README_sc.md
+++ b/README_sc.md
@@ -73,6 +73,8 @@ Usage: rvcmd [-notrs] [-dns dns.yaml] 'target/to/download'
   -f    force download even file exists
   -notrs
         use standard TLS client
+  -notui
+        use plain text instead of TUI
   -w uint
         connection waiting seconds (default 4)
   'target/to/download'
diff --git a/main.go b/main.go
index 9a27592..34fe9be 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"os"
@@ -54,6 +55,8 @@ func main() {
 		defer ui.Close()
 		sc = newscreen()
 	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
 	go func() {
 		if *dnsf != "" {
 			f, err := os.Open(*dnsf)
@@ -80,12 +83,21 @@ func main() {
 			errorln(err)
 			return
 		}
-		err = usercfg.download(args[0], "", time.Second*time.Duration(*wait), *cust, !*ntrs, *force)
-		if err != nil {
-			errorln(err)
-			return
+		ch := make(chan struct{})
+		go func() {
+			err := usercfg.download(args[0], "", time.Second*time.Duration(*wait), *cust, !*ntrs, *force)
+			ch <- struct{}{}
+			if err != nil {
+				errorln(err)
+				return
+			}
+		}()
+		select {
+		case <-ch:
+			infoln("all download tasks finished.")
+		case <-ctx.Done():
+			logrus.Warnln("download canceled")
 		}
-		infoln("all download tasks finished.")
 	}()
-	sc.flushloop(time.Second)
+	sc.show(time.Second)
 }
diff --git a/ui.go b/ui.go
index 803d42a..95a9cb3 100644
--- a/ui.go
+++ b/ui.go
@@ -47,7 +47,7 @@ func newscreen() (s screen) {
 	s.logroll.SetRect(w/2, 0, w, h/2)
 
 	s.speedln = widgets.NewPlot()
-	s.speedln.Title = "Speed"
+	s.speedln.Title = "Speed (MB/s)"
 	s.speedln.Data = make([][]float64, 1)
 	s.speedln.Data[0] = []float64{0, 0}
 	s.speedln.AxesColor = ui.ColorWhite
@@ -60,18 +60,22 @@ func newscreen() (s screen) {
 func (s *screen) logwrite(sz int) {
 	s.Lock()
 	defer s.Unlock()
+	w := s.speedln.Size().X
 	s.totaldl += sz
 	tdiff := time.Since(s.lastclr)
 	if tdiff > time.Second {
 		s.speedln.Data[0] = append(s.speedln.Data[0],
-			float64(s.totaldl/1024)/(float64(tdiff)/float64(time.Second)),
+			float64(s.totaldl/1024)/1024/(float64(tdiff)/float64(time.Second)),
 		)
+		if len(s.speedln.Data[0]) > w-5 {
+			s.speedln.Data[0] = s.speedln.Data[0][1:]
+		}
 		s.totaldl = 0
 		s.lastclr = time.Now()
 	}
 }
 
-func (s *screen) flushloop(interval time.Duration) {
+func (s *screen) show(interval time.Duration) {
 	t := time.NewTicker(interval)
 	defer t.Stop()
 	s.flush()