2 files changed, 32 insertions, 2 deletions
diff --git a/src/log/slog/attr.go b/src/log/slog/attr.go
index 2f459467cb..067c537cc9 100644
--- a/src/log/slog/attr.go
+++ b/src/log/slog/attr.go
@@ -5,7 +5,6 @@
 package slog
 
 import (
-	"fmt"
 	"time"
 )
 
@@ -92,7 +91,7 @@ func (a Attr) Equal(b Attr) bool {
 }
 
 func (a Attr) String() string {
-	return fmt.Sprintf("%s=%s", a.Key, a.Value)
+	return a.Key + "=" + a.Value.String()
 }
 
 // isEmpty reports whether a has an empty key and a nil value.
diff --git a/src/log/slog/attr_test.go b/src/log/slog/attr_test.go
index 1187a856fd..e01447cfed 100644
--- a/src/log/slog/attr_test.go
+++ b/src/log/slog/attr_test.go
@@ -41,3 +41,34 @@ func TestAttrNoAlloc(t *testing.T) {
 	_ = s
 	_ = x
 }
+
+func BenchmarkAttrString(b *testing.B) {
+	var (
+		is string
+		u  string
+		f  string
+		bn string
+		s  string
+		x  string
+		ds string
+		p  = &is
+		d  time.Duration
+	)
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		is = Int64("key", 1).String()
+		u = Uint64("key", 1).String()
+		f = Float64("key", 1).String()
+		bn = Bool("key", true).String()
+		s = String("key", "foo").String()
+		ds = Duration("key", d).String()
+		x = Any("key", p).String()
+	}
+	_ = u
+	_ = f
+	_ = bn
+	_ = s
+	_ = x
+	_ = ds
+	_ = p
+}