diff --git a/internal/proto/peek_push_notification_test.go b/internal/proto/peek_push_notification_test.go
index 58a794b8..7d439e59 100644
--- a/internal/proto/peek_push_notification_test.go
+++ b/internal/proto/peek_push_notification_test.go
@@ -95,7 +95,7 @@ func TestPeekPushNotificationName(t *testing.T) {
 		t.Run("NotPushNotification", func(t *testing.T) {
 			// Test with regular array instead of push notification
 			buf := &bytes.Buffer{}
-			buf.WriteString("*2\r\n$6\r\nMOVING\r\n$4\r\ndata\r\n")
+			fmt.Fprint(buf, "*2\r\n$6\r\nMOVING\r\n$4\r\ndata\r\n")
 			reader := NewReader(buf)
 
 			_, err := reader.PeekPushNotificationName()
@@ -112,7 +112,7 @@ func TestPeekPushNotificationName(t *testing.T) {
 		t.Run("InsufficientData", func(t *testing.T) {
 			// Test with buffer smaller than peek size - this might panic due to bounds checking
 			buf := &bytes.Buffer{}
-			buf.WriteString(">")
+			fmt.Fprint(buf, ">")
 			reader := NewReader(buf)
 
 			func() {
@@ -146,7 +146,7 @@ func TestPeekPushNotificationName(t *testing.T) {
 				t.Run(fmt.Sprintf("Type_%c", respType), func(t *testing.T) {
 					buf := &bytes.Buffer{}
 					buf.WriteByte(respType)
-					buf.WriteString("test data that fills the buffer completely")
+					fmt.Fprint(buf, "test data that fills the buffer completely")
 					reader := NewReader(buf)
 
 					_, err := reader.PeekPushNotificationName()
@@ -167,7 +167,7 @@ func TestPeekPushNotificationName(t *testing.T) {
 		t.Run("ZeroLengthArray", func(t *testing.T) {
 			// Create push notification with zero elements: >0\r\n
 			buf := &bytes.Buffer{}
-			buf.WriteString(">0\r\npadding_data_to_fill_buffer_completely")
+			fmt.Fprint(buf, ">0\r\npadding_data_to_fill_buffer_completely")
 			reader := NewReader(buf)
 
 			_, err := reader.PeekPushNotificationName()
@@ -209,7 +209,7 @@ func TestPeekPushNotificationName(t *testing.T) {
 			for _, tc := range corruptedCases {
 				t.Run(tc.name, func(t *testing.T) {
 					buf := &bytes.Buffer{}
-					buf.WriteString(tc.data)
+					fmt.Fprint(buf, tc.data)
 					reader := NewReader(buf)
 
 					// Some corrupted data might not error but return unexpected results
@@ -230,7 +230,7 @@ func TestPeekPushNotificationName(t *testing.T) {
 			// Create buffer that is exactly 36 bytes (the peek window size)
 			buf := &bytes.Buffer{}
 			// ">1\r\n$4\r\nTEST\r\n" = 14 bytes, need 22 more
-			buf.WriteString(">1\r\n$4\r\nTEST\r\n1234567890123456789012")
+			fmt.Fprint(buf, ">1\r\n$4\r\nTEST\r\n1234567890123456789012")
 			if buf.Len() != 36 {
 				t.Errorf("Expected buffer length 36, got %d", buf.Len())
 			}
@@ -295,25 +295,26 @@ func createValidPushNotification(notificationName, data string) *bytes.Buffer {
 	buf := &bytes.Buffer{}
 
 	simpleOrString := rand.Intn(2) == 0
+	defMsg := fmt.Sprintf("$%d\r\n%s\r\n", len(notificationName), notificationName)
 
 	if data == "" {
 
 		// Single element notification
-		buf.WriteString(">1\r\n")
+		fmt.Fprint(buf, ">1\r\n")
 		if simpleOrString {
-			buf.WriteString(fmt.Sprintf("+%s\r\n", notificationName))
+			fmt.Fprintf(buf, "+%s\r\n", notificationName)
 		} else {
-			buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(notificationName), notificationName))
+			fmt.Fprint(buf, defMsg)
 		}
 	} else {
 		// Two element notification
-		buf.WriteString(">2\r\n")
+		fmt.Fprint(buf, ">2\r\n")
 		if simpleOrString {
-			buf.WriteString(fmt.Sprintf("+%s\r\n", notificationName))
-			buf.WriteString(fmt.Sprintf("+%s\r\n", data))
+			fmt.Fprintf(buf, "+%s\r\n", notificationName)
+			fmt.Fprintf(buf, "+%s\r\n", data)
 		} else {
-			buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(notificationName), notificationName))
-			buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(notificationName), notificationName))
+			fmt.Fprint(buf, defMsg)
+			fmt.Fprint(buf, defMsg)
 		}
 	}
 
@@ -333,14 +334,14 @@ func createPushNotificationWithArgs(notificationName string, args ...string) *by
 	buf := &bytes.Buffer{}
 
 	totalElements := 1 + len(args)
-	buf.WriteString(fmt.Sprintf(">%d\r\n", totalElements))
+	fmt.Fprintf(buf, ">%d\r\n", totalElements)
 
 	// Write notification name
-	buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(notificationName), notificationName))
+	fmt.Fprintf(buf, "$%d\r\n%s\r\n", len(notificationName), notificationName)
 
 	// Write arguments
 	for _, arg := range args {
-		buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(arg), arg))
+		fmt.Fprintf(buf, "$%d\r\n%s\r\n", len(arg), arg)
 	}
 
 	return buf
@@ -349,8 +350,8 @@ func createPushNotificationWithArgs(notificationName string, args ...string) *by
 // createSingleElementPushNotification creates a push notification with single element
 func createSingleElementPushNotification(notificationName string) *bytes.Buffer {
 	buf := &bytes.Buffer{}
-	buf.WriteString(">1\r\n")
-	buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(notificationName), notificationName))
+	fmt.Fprint(buf, ">1\r\n")
+	fmt.Fprintf(buf, "$%d\r\n%s\r\n", len(notificationName), notificationName)
 	return buf
 }
 
diff --git a/internal/proto/reader_test.go b/internal/proto/reader_test.go
index 2d5f56c7..ace954fa 100644
--- a/internal/proto/reader_test.go
+++ b/internal/proto/reader_test.go
@@ -2,6 +2,7 @@ package proto_test
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"testing"
 
@@ -86,7 +87,7 @@ func TestReader_ReadLine(t *testing.T) {
 func benchmarkParseReply(b *testing.B, reply string, wanterr bool) {
 	buf := new(bytes.Buffer)
 	for i := 0; i < b.N; i++ {
-		buf.WriteString(reply)
+		fmt.Fprint(buf, reply)
 	}
 	p := proto.NewReader(buf)
 	b.ResetTimer()
diff --git a/push/push_test.go b/push/push_test.go
index b98b5f16..4ce4a24d 100644
--- a/push/push_test.go
+++ b/push/push_test.go
@@ -837,14 +837,14 @@ func createFakeRESP3PushNotification(notificationType string, args ...string) *b
 
 	// RESP3 Push notification format: ><len>\r\n<elements>\r\n
 	totalElements := 1 + len(args) // notification type + arguments
-	buf.WriteString(fmt.Sprintf(">%d\r\n", totalElements))
+	fmt.Fprintf(buf, ">%d\r\n", totalElements)
 
 	// Write notification type as bulk string
-	buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(notificationType), notificationType))
+	fmt.Fprintf(buf, "$%d\r\n%s\r\n", len(notificationType), notificationType)
 
 	// Write arguments as bulk strings
 	for _, arg := range args {
-		buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(arg), arg))
+		fmt.Fprintf(buf, "$%d\r\n%s\r\n", len(arg), arg)
 	}
 
 	return buf
@@ -868,11 +868,11 @@ func createFakeRESP3Array(elements ...string) *bytes.Buffer {
 	buf := &bytes.Buffer{}
 
 	// RESP3 Array format: *<len>\r\n<elements>\r\n
-	buf.WriteString(fmt.Sprintf("*%d\r\n", len(elements)))
+	fmt.Fprintf(buf, "*%d\r\n", len(elements))
 
 	// Write elements as bulk strings
 	for _, element := range elements {
-		buf.WriteString(fmt.Sprintf("$%d\r\n%s\r\n", len(element), element))
+		fmt.Fprintf(buf, "$%d\r\n%s\r\n", len(element), element)
 	}
 
 	return buf
@@ -881,7 +881,7 @@ func createFakeRESP3Array(elements ...string) *bytes.Buffer {
 // createFakeRESP3Error creates a fake RESP3 error
 func createFakeRESP3Error(message string) *bytes.Buffer {
 	buf := &bytes.Buffer{}
-	buf.WriteString(fmt.Sprintf("-%s\r\n", message))
+	fmt.Fprintf(buf, "-%s\r\n", message)
 	return buf
 }
 
@@ -1117,7 +1117,7 @@ func TestProcessorWithFakeBuffer(t *testing.T) {
 
 		// Create fake RESP3 push notification with no elements
 		buf := &bytes.Buffer{}
-		buf.WriteString(">0\r\n") // Empty push notification
+		fmt.Fprint(buf, ">0\r\n") // Empty push notification
 		reader := createReaderWithPrimedBuffer(buf)
 
 		ctx := context.Background()
@@ -1154,9 +1154,9 @@ func TestProcessorWithFakeBuffer(t *testing.T) {
 
 		// Create fake RESP3 push notification with integer as first element
 		buf := &bytes.Buffer{}
-		buf.WriteString(">2\r\n")         // 2 elements
-		buf.WriteString(":123\r\n")       // Integer instead of string
-		buf.WriteString("$4\r\ndata\r\n") // String data
+		fmt.Fprint(buf, ">2\r\n")         // 2 elements
+		fmt.Fprint(buf, ":123\r\n")       // Integer instead of string
+		fmt.Fprint(buf, "$4\r\ndata\r\n") // String data
 		reader := proto.NewReader(buf)
 
 		ctx := context.Background()
@@ -1273,8 +1273,8 @@ func TestVoidProcessorWithFakeBuffer(t *testing.T) {
 
 		// Create invalid RESP3 data
 		buf := &bytes.Buffer{}
-		buf.WriteString(">1\r\n")      // Push notification with 1 element
-		buf.WriteString("invalid\r\n") // Invalid format (should be $<len>\r\n<data>\r\n)
+		fmt.Fprint(buf, ">1\r\n")      // Push notification with 1 element
+		fmt.Fprint(buf, "invalid\r\n") // Invalid format (should be $<len>\r\n<data>\r\n)
 		reader := proto.NewReader(buf)
 
 		ctx := context.Background()
@@ -1332,9 +1332,9 @@ func TestProcessorErrorHandling(t *testing.T) {
 
 		// Create buffer with corrupted RESP3 data
 		buf := &bytes.Buffer{}
-		buf.WriteString(">2\r\n")           // Says 2 elements
-		buf.WriteString("$6\r\nMOVING\r\n") // First element OK
-		buf.WriteString("corrupted")        // Second element corrupted (no proper format)
+		fmt.Fprint(buf, ">2\r\n")           // Says 2 elements
+		fmt.Fprint(buf, "$6\r\nMOVING\r\n") // First element OK
+		fmt.Fprint(buf, "corrupted")        // Second element corrupted (no proper format)
 		reader := proto.NewReader(buf)
 
 		ctx := context.Background()
@@ -1360,8 +1360,8 @@ func TestProcessorErrorHandling(t *testing.T) {
 
 		// Create buffer with partial RESP3 data
 		buf := &bytes.Buffer{}
-		buf.WriteString(">2\r\n")           // Says 2 elements
-		buf.WriteString("$6\r\nMOVING\r\n") // First element OK
+		fmt.Fprint(buf, ">2\r\n")           // Says 2 elements
+		fmt.Fprint(buf, "$6\r\nMOVING\r\n") // First element OK
 		// Missing second element
 		reader := proto.NewReader(buf)