diff --git a/binary/utils.go b/binary/utils.go
index 07134191..58fa592c 100644
--- a/binary/utils.go
+++ b/binary/utils.go
@@ -6,7 +6,6 @@ import (
 	"compress/zlib"
 	binary2 "encoding/binary"
 	"encoding/hex"
-	"io"
 	"net"
 
 	"github.com/Mrs4s/MiraiGo/utils"
@@ -34,7 +33,7 @@ func ZlibUncompress(src []byte) []byte {
 	var out bytes.Buffer
 	r, _ := zlib.NewReader(b)
 	defer r.Close()
-	io.Copy(&out, r)
+	_, _ = out.ReadFrom(r)
 	return out.Bytes()
 }
 
@@ -42,7 +41,8 @@ func ZlibCompress(data []byte) []byte {
 	zw := acquireZlibWriter()
 	_, _ = zw.w.Write(data)
 	_ = zw.w.Close()
-	ret := append([]byte(nil), zw.buf.Bytes()...)
+	ret := make([]byte, len(zw.buf.Bytes()))
+	copy(ret, zw.buf.Bytes())
 	releaseZlibWriter(zw)
 	return ret
 }
@@ -51,7 +51,8 @@ func GZipCompress(data []byte) []byte {
 	gw := AcquireGzipWriter()
 	_, _ = gw.Write(data)
 	_ = gw.Close()
-	ret := append([]byte(nil), gw.buf.Bytes()...)
+	ret := make([]byte, len(gw.buf.Bytes()))
+	copy(ret, gw.buf.Bytes())
 	ReleaseGzipWriter(gw)
 	return ret
 }
@@ -61,7 +62,7 @@ func GZipUncompress(src []byte) []byte {
 	var out bytes.Buffer
 	r, _ := gzip.NewReader(b)
 	defer r.Close()
-	_, _ = io.Copy(&out, r)
+	_, _ = out.ReadFrom(r)
 	return out.Bytes()
 }
 
diff --git a/binary/writer.go b/binary/writer.go
index d8a8703a..837cd862 100644
--- a/binary/writer.go
+++ b/binary/writer.go
@@ -12,7 +12,8 @@ type Writer bytes.Buffer
 func NewWriterF(f func(writer *Writer)) []byte {
 	w := SelectWriter()
 	f(w)
-	b := append([]byte(nil), w.Bytes()...)
+	b := make([]byte, len(w.Bytes()))
+	copy(b, w.Bytes())
 	w.put()
 	return b
 }
diff --git a/client/internal/oicq/oicq.go b/client/internal/oicq/oicq.go
index c4469a40..9abe167f 100644
--- a/client/internal/oicq/oicq.go
+++ b/client/internal/oicq/oicq.go
@@ -84,7 +84,8 @@ func (c *Codec) Marshal(m *Message) []byte {
 	}
 	w.WriteByte(0x03)
 
-	buf := append([]byte(nil), w.Bytes()...)
+	buf := make([]byte, len(w.Bytes()))
+	copy(buf, w.Bytes())
 	goBinary.BigEndian.PutUint16(buf[1:3], uint16(len(buf)))
 	return buf
 }
diff --git a/message/forward.go b/message/forward.go
index 689d4cd8..a1226bb2 100644
--- a/message/forward.go
+++ b/message/forward.go
@@ -1,9 +1,9 @@
 package message
 
 import (
-	"bytes"
 	"crypto/md5"
 	"regexp"
+	"strings"
 	"sync"
 
 	"github.com/Mrs4s/MiraiGo/binary"
@@ -79,7 +79,7 @@ func (f *ForwardMessage) AddNode(node *ForwardNode) *ForwardMessage {
 func (f *ForwardMessage) Length() int { return len(f.Nodes) }
 
 func (f *ForwardMessage) Brief() string {
-	var brief bytes.Buffer
+	var brief strings.Builder
 	for _, n := range f.Nodes {
 		brief.WriteString(ToReadableString(n.Message))
 		if brief.Len() >= 27 {
@@ -90,7 +90,7 @@ func (f *ForwardMessage) Brief() string {
 }
 
 func (f *ForwardMessage) Preview() string {
-	var pv bytes.Buffer
+	var pv strings.Builder
 	for i, node := range f.Nodes {
 		if i >= 4 {
 			break
diff --git a/utils/sys.go b/utils/sys.go
index b9d78312..cdd8b69b 100644
--- a/utils/sys.go
+++ b/utils/sys.go
@@ -20,7 +20,7 @@ func ComputeMd5AndLength(r io.Reader) ([]byte, int64) {
 
 func (r *multiReadSeeker) Read(p []byte) (int, error) {
 	if r.multiReader == nil {
-		var readers []io.Reader
+		readers := make([]io.Reader, len(r.readers))
 		for i := range r.readers {
 			_, _ = r.readers[i].Seek(0, io.SeekStart)
 			readers = append(readers, r.readers[i])