diff --git a/render.go b/render.go
index e96eca1..4ac38bd 100644
--- a/render.go
+++ b/render.go
@@ -188,12 +188,19 @@ func statusCell(v uint64) string {
 	return paint(s, cRed)
 }
 
+// Per-interval rates jitter by a couple of percent at line rate, so green has
+// to cover that. Yellow means a real shortfall, red means badly off.
+const (
+	rateGreenFrac  = 0.95
+	rateYellowFrac = 0.80
+)
+
 func rateCell(gb float64, target float64) string {
 	s := fmt.Sprintf("%.2f", gb)
 	switch {
-	case gb >= target*0.995:
+	case gb >= target*rateGreenFrac:
 		return paint(s, cGreen)
-	case gb >= target*0.90:
+	case gb >= target*rateYellowFrac:
 		return paint(s, cYellow)
 	default:
 		return paint(s, cRed)