diff --git a/client/builders.go b/client/builders.go
index ca9e85c4..66d6e8c4 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -1000,16 +1000,6 @@ func (c *QQClient) buildGroupNameUpdatePacket(groupCode int64, newName string) (
 	return c.buildGroupOperationPacket(body)
 }
 
-func (c *QQClient) buildGroupMemoUpdatePacket(groupCode int64, newMemo string) (uint16, []byte) {
-	body := &oidb.D89AReqBody{
-		GroupCode: groupCode,
-		StGroupInfo: &oidb.D89AGroupinfo{
-			IngGroupMemo: []byte(newMemo),
-		},
-	}
-	return c.buildGroupOperationPacket(body)
-}
-
 // OidbSvc.0x89a_0
 func (c *QQClient) buildGroupMuteAllPacket(groupCode int64, mute bool) (uint16, []byte) {
 	shutUpTime := int32(0)
diff --git a/client/client.go b/client/client.go
index 1402433f..db270ef1 100644
--- a/client/client.go
+++ b/client/client.go
@@ -19,6 +19,7 @@ import (
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/client/internal/auth"
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/intern"
 	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/internal/oicq"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
@@ -578,6 +579,7 @@ func (c *QQClient) GetGroupList() ([]*GroupInfo, error) {
 	if err != nil {
 		return nil, err
 	}
+	interner := intern.NewStringInterner()
 	r := rsp.([]*GroupInfo)
 	wg := sync.WaitGroup{}
 	batch := 50
@@ -590,11 +592,12 @@ func (c *QQClient) GetGroupList() ([]*GroupInfo, error) {
 		for j := i; j < k; j++ {
 			go func(g *GroupInfo, wg *sync.WaitGroup) {
 				defer wg.Done()
-				m, err := c.GetGroupMembers(g)
+				m, err := c.getGroupMembers(g, interner)
 				if err != nil {
 					return
 				}
 				g.Members = m
+				g.Name = interner.Intern(g.Name)
 			}(r[j], &wg)
 		}
 		wg.Wait()
@@ -603,6 +606,11 @@ func (c *QQClient) GetGroupList() ([]*GroupInfo, error) {
 }
 
 func (c *QQClient) GetGroupMembers(group *GroupInfo) ([]*GroupMemberInfo, error) {
+	interner := intern.NewStringInterner()
+	return c.getGroupMembers(group, interner)
+}
+
+func (c *QQClient) getGroupMembers(group *GroupInfo, interner *intern.StringInterner) ([]*GroupMemberInfo, error) {
 	var nextUin int64
 	var list []*GroupMemberInfo
 	for {
@@ -620,6 +628,9 @@ func (c *QQClient) GetGroupMembers(group *GroupInfo) ([]*GroupMemberInfo, error)
 			if m.Uin == group.OwnerUin {
 				m.Permission = Owner
 			}
+			m.CardName = interner.Intern(m.CardName)
+			m.Nickname = interner.Intern(m.Nickname)
+			m.SpecialTitle = interner.Intern(m.SpecialTitle)
 		}
 		list = append(list, rsp.list...)
 		if nextUin == 0 {
@@ -755,10 +766,6 @@ func (c *QQClient) updateGroupName(groupCode int64, newName string) {
 	_, _ = c.sendAndWait(c.buildGroupNameUpdatePacket(groupCode, newName))
 }
 
-func (c *QQClient) updateGroupMemo(groupCode int64, newMemo string) {
-	_, _ = c.sendAndWait(c.buildGroupMemoUpdatePacket(groupCode, newMemo))
-}
-
 func (c *QQClient) groupMuteAll(groupCode int64, mute bool) {
 	_, _ = c.sendAndWait(c.buildGroupMuteAllPacket(groupCode, mute))
 }
diff --git a/client/decoders.go b/client/decoders.go
index 6a021980..9fa05b43 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -509,7 +509,6 @@ func decodeGroupListResponse(c *QQClient, _ *network.IncomingPacketInfo, payload
 			Uin:            g.GroupUin,
 			Code:           g.GroupCode,
 			Name:           g.GroupName,
-			Memo:           g.GroupMemo,
 			OwnerUin:       g.GroupOwnerUin,
 			MemberCount:    uint16(g.MemberNum),
 			MaxMemberCount: uint16(g.MaxGroupMemberNum),
@@ -537,6 +536,10 @@ func decodeGroupMemberListResponse(_ *QQClient, _ *network.IncomingPacketInfo, p
 	next := r.ReadInt64(4)
 	l := make([]*GroupMemberInfo, 0, len(members))
 	for _, m := range members {
+		permission := Member
+		if m.Flag&1 != 0 {
+			permission = Administrator
+		}
 		l = append(l, &GroupMemberInfo{
 			Uin:             m.MemberUin,
 			Nickname:        m.Nick,
@@ -547,12 +550,7 @@ func decodeGroupMemberListResponse(_ *QQClient, _ *network.IncomingPacketInfo, p
 			LastSpeakTime:   m.LastSpeakTime,
 			SpecialTitle:    m.SpecialTitle,
 			ShutUpTimestamp: m.ShutUpTimestap,
-			Permission: func() MemberPermission {
-				if m.Flag == 1 {
-					return Administrator
-				}
-				return Member
-			}(),
+			Permission:      permission,
 		})
 	}
 	return &groupMemberListResponse{
diff --git a/client/group_info.go b/client/group_info.go
index fbe24303..4b7b1f1d 100644
--- a/client/group_info.go
+++ b/client/group_info.go
@@ -27,7 +27,6 @@ type (
 		Uin             int64
 		Code            int64
 		Name            string
-		Memo            string
 		OwnerUin        int64
 		GroupCreateTime uint32
 		GroupLevel      uint32
@@ -237,7 +236,6 @@ func decodeGroupInfoResponse(c *QQClient, _ *network.IncomingPacketInfo, payload
 		Uin:             int64(*info.GroupInfo.GroupUin),
 		Code:            int64(*info.GroupCode),
 		Name:            string(info.GroupInfo.GroupName),
-		Memo:            string(info.GroupInfo.GroupMemo),
 		GroupCreateTime: *info.GroupInfo.GroupCreateTime,
 		GroupLevel:      *info.GroupInfo.GroupLevel,
 		OwnerUin:        int64(*info.GroupInfo.GroupOwner),
@@ -270,13 +268,6 @@ func (g *GroupInfo) UpdateName(newName string) {
 	}
 }
 
-func (g *GroupInfo) UpdateMemo(newMemo string) {
-	if g.AdministratorOrOwner() {
-		g.client.updateGroupMemo(g.Code, newMemo)
-		g.Memo = newMemo
-	}
-}
-
 func (g *GroupInfo) UpdateGroupHeadPortrait(img []byte) {
 	if g.AdministratorOrOwner() {
 		_ = g.client.uploadGroupHeadPortrait(g.Uin, img)
diff --git a/client/internal/intern/string.go b/client/internal/intern/string.go
new file mode 100644
index 00000000..a112cff6
--- /dev/null
+++ b/client/internal/intern/string.go
@@ -0,0 +1,32 @@
+package intern
+
+import (
+	"sync"
+)
+
+// String Interning is a technique for reducing the memory footprint of large
+// strings. It can re-use strings that are already in memory.
+
+type StringInterner struct {
+	mu      sync.RWMutex
+	strings map[string]string
+}
+
+func NewStringInterner() *StringInterner {
+	return &StringInterner{
+		strings: make(map[string]string),
+	}
+}
+
+func (i *StringInterner) Intern(s string) string {
+	i.mu.RLock()
+	if v, ok := i.strings[s]; ok {
+		i.mu.RUnlock()
+		return v
+	}
+	i.mu.RUnlock()
+	i.mu.Lock()
+	i.strings[s] = s
+	i.mu.Unlock()
+	return s
+}