diff --git a/parse_test.go b/parse_test.go
index 0201c57..365a5ab 100644
--- a/parse_test.go
+++ b/parse_test.go
@@ -147,16 +147,32 @@ func TestParseString (test *testing.T) {
 
 func BenchmarkParseStringLatin (benchmark *testing.B) {
 	benchmark.ReportAllocs()
+	var meanLen, meanCap int
 	for i := 0; i < benchmark.N; i ++ {
-		parseString(lipsumLt)
+		runes, _ := parseString(lipsumLt)
+		meanLen += len(runes)
+		meanCap += cap(runes)
 	}
+	meanLen /= benchmark.N
+	meanCap /= benchmark.N	
+	benchmark.ReportMetric(float64(meanLen), "len")
+	benchmark.ReportMetric(float64(meanCap), "cap")
+	benchmark.ReportMetric(float64(meanCap - meanLen), "waste")
 }
 
 func BenchmarkParseStringChinese (benchmark *testing.B) {
 	benchmark.ReportAllocs()
+	var meanLen, meanCap int
 	for i := 0; i < benchmark.N; i ++ {
-		parseString(lipsumCn)
+		runes, _ := parseString(lipsumCn)
+		meanLen += len(runes)
+		meanCap += cap(runes)
 	}
+	meanLen /= benchmark.N
+	meanCap /= benchmark.N	
+	benchmark.ReportMetric(float64(meanLen), "len")
+	benchmark.ReportMetric(float64(meanCap), "cap")
+	benchmark.ReportMetric(float64(meanCap - meanLen), "waste")
 }
 
 const lipsumLt =