diff --git a/internal/bytesconv/bytesconv_timing_test.go b/internal/bytesconv/bytesconv_timing_test.go
new file mode 100644
index 000000000..4e0e27ba9
--- /dev/null
+++ b/internal/bytesconv/bytesconv_timing_test.go
@@ -0,0 +1,36 @@
+package bytesconv
+
+import (
+	"golang.org/x/net/http/httpguts"
+	"testing"
+)
+
+func BenchmarkValidHeaderFiledValueTable(b *testing.B) {
+	// Test all characters
+	allBytes := make([]string, 0)
+	for i := 0; i < 256; i++ {
+		allBytes = append(allBytes, string([]byte{byte(i)}))
+	}
+
+	for i := 0; i < b.N; i++ {
+		for _, s := range allBytes {
+			_ = httpguts.ValidHeaderFieldValue(s)
+		}
+	}
+}
+
+func BenchmarkValidHeaderFiledValueTableHertz(b *testing.B) {
+	// Test all characters
+	allBytes := make([]byte, 0)
+	for i := 0; i < 256; i++ {
+		allBytes = append(allBytes, byte(i))
+	}
+
+	for i := 0; i < b.N; i++ {
+		for _, s := range allBytes {
+			_ = func() bool {
+				return ValidHeaderFieldValueTable[s] != 0
+			}()
+		}
+	}
+}