diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 6dc2e5e22..436d4224d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -242,6 +242,9 @@ npx ts-node ./node_modules/typeorm/cli.js migration:generate -n 変更の名前
 
 作成されたスクリプトは不必要な変更を含むため除去してください。
 
+### コネクションには`markRaw`せよ
+**Vueのコンポーネントのdataオプションとして**misskey.jsのコネクションを設定するとき、必ず`markRaw`でラップしてください。インスタンスが不必要にリアクティブ化されることで、misskey.js内の処理で不具合が発生するとともに、パフォーマンス上の問題にも繋がる。なお、Composition APIを使う場合はこの限りではない(リアクティブ化はマニュアルなため)。
+
 ## その他
 ### HTMLのクラス名で follow という単語は使わない
 広告ブロッカーで誤ってブロックされる
diff --git a/src/client/components/drive.vue b/src/client/components/drive.vue
index ca637e3f3..16aa9dc1a 100644
--- a/src/client/components/drive.vue
+++ b/src/client/components/drive.vue
@@ -46,7 +46,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import XNavFolder from './drive.nav-folder.vue';
 import XFolder from './drive.folder.vue';
 import XFile from './drive.file.vue';
@@ -139,7 +139,7 @@ export default defineComponent({
 			});
 		}
 
-		this.connection = os.stream.useChannel('drive');
+		this.connection = markRaw(os.stream.useChannel('drive'));
 
 		this.connection.on('fileCreated', this.onStreamDriveFileCreated);
 		this.connection.on('fileUpdated', this.onStreamDriveFileUpdated);
diff --git a/src/client/components/follow-button.vue b/src/client/components/follow-button.vue
index 49bf67849..5685b86a5 100644
--- a/src/client/components/follow-button.vue
+++ b/src/client/components/follow-button.vue
@@ -28,7 +28,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import * as os from '@client/os';
 
 export default defineComponent({
@@ -71,7 +71,7 @@ export default defineComponent({
 	},
 
 	mounted() {
-		this.connection = os.stream.useChannel('main');
+		this.connection = markRaw(os.stream.useChannel('main'));
 
 		this.connection.on('follow', this.onFollowChange);
 		this.connection.on('unfollow', this.onFollowChange);
diff --git a/src/client/components/notification.vue b/src/client/components/notification.vue
index c7063b0aa..d4e6b65c7 100644
--- a/src/client/components/notification.vue
+++ b/src/client/components/notification.vue
@@ -58,7 +58,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import { getNoteSummary } from '@/misc/get-note-summary';
 import XReactionIcon from './reaction-icon.vue';
 import MkFollowButton from './follow-button.vue';
@@ -109,7 +109,7 @@ export default defineComponent({
 
 			this.readObserver.observe(this.$el);
 
-			this.connection = os.stream.useChannel('main');
+			this.connection = markRaw(os.stream.useChannel('main'));
 			this.connection.on('readAllNotifications', () => this.readObserver.unobserve(this.$el));
 		}
 	},
diff --git a/src/client/components/notifications.vue b/src/client/components/notifications.vue
index 092c00f14..9db47e08d 100644
--- a/src/client/components/notifications.vue
+++ b/src/client/components/notifications.vue
@@ -21,7 +21,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent, PropType } from 'vue';
+import { defineComponent, PropType, markRaw } from 'vue';
 import paging from '@client/scripts/paging';
 import XNotification from './notification.vue';
 import XList from './date-separated-list.vue';
@@ -89,7 +89,7 @@ export default defineComponent({
 	},
 
 	mounted() {
-		this.connection = os.stream.useChannel('main');
+		this.connection = markRaw(os.stream.useChannel('main'));
 		this.connection.on('notification', this.onNotification);
 	},
 
diff --git a/src/client/components/timeline.vue b/src/client/components/timeline.vue
index c21e1ec2a..9676616f2 100644
--- a/src/client/components/timeline.vue
+++ b/src/client/components/timeline.vue
@@ -3,7 +3,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import XNotes from './notes.vue';
 import * as os from '@client/os';
 import * as sound from '@client/scripts/sound';
@@ -92,33 +92,33 @@ export default defineComponent({
 			this.query = {
 				antennaId: this.antenna
 			};
-			this.connection = os.stream.useChannel('antenna', {
+			this.connection = markRaw(os.stream.useChannel('antenna', {
 				antennaId: this.antenna
-			});
+			}));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'home') {
 			endpoint = 'notes/timeline';
-			this.connection = os.stream.useChannel('homeTimeline');
+			this.connection = markRaw(os.stream.useChannel('homeTimeline'));
 			this.connection.on('note', prepend);
 
-			this.connection2 = os.stream.useChannel('main');
+			this.connection2 = markRaw(os.stream.useChannel('main'));
 			this.connection2.on('follow', onChangeFollowing);
 			this.connection2.on('unfollow', onChangeFollowing);
 		} else if (this.src == 'local') {
 			endpoint = 'notes/local-timeline';
-			this.connection = os.stream.useChannel('localTimeline');
+			this.connection = markRaw(os.stream.useChannel('localTimeline'));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'social') {
 			endpoint = 'notes/hybrid-timeline';
-			this.connection = os.stream.useChannel('hybridTimeline');
+			this.connection = markRaw(os.stream.useChannel('hybridTimeline'));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'global') {
 			endpoint = 'notes/global-timeline';
-			this.connection = os.stream.useChannel('globalTimeline');
+			this.connection = markRaw(os.stream.useChannel('globalTimeline'));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'mentions') {
 			endpoint = 'notes/mentions';
-			this.connection = os.stream.useChannel('main');
+			this.connection = markRaw(os.stream.useChannel('main'));
 			this.connection.on('mention', prepend);
 		} else if (this.src == 'directs') {
 			endpoint = 'notes/mentions';
@@ -130,16 +130,16 @@ export default defineComponent({
 					prepend(note);
 				}
 			};
-			this.connection = os.stream.useChannel('main');
+			this.connection = markRaw(os.stream.useChannel('main'));
 			this.connection.on('mention', onNote);
 		} else if (this.src == 'list') {
 			endpoint = 'notes/user-list-timeline';
 			this.query = {
 				listId: this.list
 			};
-			this.connection = os.stream.useChannel('userList', {
+			this.connection = markRaw(os.stream.useChannel('userList', {
 				listId: this.list
-			});
+			}));
 			this.connection.on('note', prepend);
 			this.connection.on('userAdded', onUserAdded);
 			this.connection.on('userRemoved', onUserRemoved);
@@ -148,9 +148,9 @@ export default defineComponent({
 			this.query = {
 				channelId: this.channel
 			};
-			this.connection = os.stream.useChannel('channel', {
+			this.connection = markRaw(os.stream.useChannel('channel', {
 				channelId: this.channel
-			});
+			}));
 			this.connection.on('note', prepend);
 		}
 
diff --git a/src/client/init.ts b/src/client/init.ts
index d1c408bb7..e6b308c5f 100644
--- a/src/client/init.ts
+++ b/src/client/init.ts
@@ -6,7 +6,7 @@ import '@client/style.scss';
 
 import * as Sentry from '@sentry/browser';
 import { Integrations } from '@sentry/tracing';
-import { computed, createApp, watch } from 'vue';
+import { computed, createApp, watch, markRaw } from 'vue';
 
 import widgets from '@client/widgets';
 import directives from '@client/directives';
@@ -282,7 +282,7 @@ if ($i) {
 		}
 	}
 
-	const main = stream.useChannel('main', null, 'System');
+	const main = markRaw(stream.useChannel('main', null, 'System'));
 
 	// 自分の情報が更新されたとき
 	main.on('meUpdated', i => {
diff --git a/src/client/pages/instance/metrics.vue b/src/client/pages/instance/metrics.vue
index 407cce9e7..131af37c7 100644
--- a/src/client/pages/instance/metrics.vue
+++ b/src/client/pages/instance/metrics.vue
@@ -90,7 +90,7 @@ export default defineComponent({
 			stats: null,
 			serverInfo: null,
 			connection: null,
-			queueConnection: os.stream.useChannel('queueStats'),
+			queueConnection: markRaw(os.stream.useChannel('queueStats')),
 			memUsage: 0,
 			chartCpuMem: null,
 			chartNet: null,
@@ -121,7 +121,7 @@ export default defineComponent({
 		os.api('admin/server-info', {}).then(res => {
 			this.serverInfo = res;
 
-			this.connection = os.stream.useChannel('serverStats');
+			this.connection = markRaw(os.stream.useChannel('serverStats'));
 			this.connection.on('stats', this.onStats);
 			this.connection.on('statsLog', this.onStatsLog);
 			this.connection.send('requestLog', {
diff --git a/src/client/pages/instance/queue.vue b/src/client/pages/instance/queue.vue
index 8f56fd74b..e8ec0bc97 100644
--- a/src/client/pages/instance/queue.vue
+++ b/src/client/pages/instance/queue.vue
@@ -11,7 +11,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import MkButton from '@client/components/ui/button.vue';
 import XQueue from './queue.chart.vue';
 import FormBase from '@client/components/form/base.vue';
@@ -35,7 +35,7 @@ export default defineComponent({
 				title: this.$ts.jobQueue,
 				icon: 'fas fa-clipboard-list',
 			},
-			connection: os.stream.useChannel('queueStats'),
+			connection: markRaw(os.stream.useChannel('queueStats')),
 		}
 	},
 
diff --git a/src/client/pages/messaging/index.vue b/src/client/pages/messaging/index.vue
index 87ca1890f..b9c29492c 100644
--- a/src/client/pages/messaging/index.vue
+++ b/src/client/pages/messaging/index.vue
@@ -37,7 +37,7 @@
 </template>
 
 <script lang="ts">
-import { defineAsyncComponent, defineComponent } from 'vue';
+import { defineAsyncComponent, defineComponent, markRaw } from 'vue';
 import { getAcct } from '@/misc/acct';
 import MkButton from '@client/components/ui/button.vue';
 import { acct } from '../../filters/user';
@@ -63,7 +63,7 @@ export default defineComponent({
 	},
 
 	mounted() {
-		this.connection = os.stream.useChannel('messagingIndex');
+		this.connection = markRaw(os.stream.useChannel('messagingIndex'));
 
 		this.connection.on('message', this.onMessage);
 		this.connection.on('read', this.onRead);
diff --git a/src/client/pages/messaging/messaging-room.vue b/src/client/pages/messaging/messaging-room.vue
index 6ec60566b..396f5f56f 100644
--- a/src/client/pages/messaging/messaging-room.vue
+++ b/src/client/pages/messaging/messaging-room.vue
@@ -36,7 +36,7 @@
 </template>
 
 <script lang="ts">
-import { computed, defineComponent } from 'vue';
+import { computed, defineComponent, markRaw } from 'vue';
 import XList from '@client/components/date-separated-list.vue';
 import XMessage from './messaging-room.message.vue';
 import XForm from './messaging-room.form.vue';
@@ -141,10 +141,10 @@ const Component = defineComponent({
 				this.group = group;
 			}
 
-			this.connection = os.stream.useChannel('messaging', {
+			this.connection = markRaw(os.stream.useChannel('messaging', {
 				otherparty: this.user ? this.user.id : undefined,
 				group: this.group ? this.group.id : undefined,
-			});
+			}));
 
 			this.connection.on('message', this.onMessage);
 			this.connection.on('read', this.onRead);
diff --git a/src/client/pages/reversi/game.vue b/src/client/pages/reversi/game.vue
index dc4d11ca4..ae10b45b5 100644
--- a/src/client/pages/reversi/game.vue
+++ b/src/client/pages/reversi/game.vue
@@ -5,7 +5,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import GameSetting from './game.setting.vue';
 import GameBoard from './game.board.vue';
 import * as os from '@client/os';
@@ -61,9 +61,9 @@ export default defineComponent({
 				if (this.connection) {
 					this.connection.dispose();
 				}
-				this.connection = os.stream.useChannel('gamesReversiGame', {
+				this.connection = markRaw(os.stream.useChannel('gamesReversiGame', {
 					gameId: this.game.id
-				});
+				}));
 				this.connection.on('started', this.onStarted);
 			});
 		},
diff --git a/src/client/pages/reversi/index.vue b/src/client/pages/reversi/index.vue
index dd329084a..cedfd1208 100644
--- a/src/client/pages/reversi/index.vue
+++ b/src/client/pages/reversi/index.vue
@@ -60,7 +60,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import * as os from '@client/os';
 import MkButton from '@client/components/ui/button.vue';
 import MkFolder from '@client/components/ui/folder.vue';
@@ -92,7 +92,7 @@ export default defineComponent({
 
 	mounted() {
 		if (this.$i) {
-			this.connection = os.stream.useChannel('gamesReversi');
+			this.connection = markRaw(os.stream.useChannel('gamesReversi'));
 
 			this.connection.on('invited', this.onInvited);
 
diff --git a/src/client/ui/chat/timeline.vue b/src/client/ui/chat/timeline.vue
index 2245a9d8a..0fbcbfb71 100644
--- a/src/client/ui/chat/timeline.vue
+++ b/src/client/ui/chat/timeline.vue
@@ -23,7 +23,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import XNotes from './notes.vue';
 import * as os from '@client/os';
 import * as sound from '@client/scripts/sound';
@@ -121,33 +121,33 @@ export default defineComponent({
 			this.query = {
 				antennaId: this.antenna
 			};
-			this.connection = os.stream.useChannel('antenna', {
+			this.connection = markRaw(os.stream.useChannel('antenna', {
 				antennaId: this.antenna
-			});
+			}));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'home') {
 			endpoint = 'notes/timeline';
-			this.connection = os.stream.useChannel('homeTimeline');
+			this.connection = markRaw(os.stream.useChannel('homeTimeline'));
 			this.connection.on('note', prepend);
 
-			this.connection2 = os.stream.useChannel('main');
+			this.connection2 = markRaw(os.stream.useChannel('main'));
 			this.connection2.on('follow', onChangeFollowing);
 			this.connection2.on('unfollow', onChangeFollowing);
 		} else if (this.src == 'local') {
 			endpoint = 'notes/local-timeline';
-			this.connection = os.stream.useChannel('localTimeline');
+			this.connection = markRaw(os.stream.useChannel('localTimeline'));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'social') {
 			endpoint = 'notes/hybrid-timeline';
-			this.connection = os.stream.useChannel('hybridTimeline');
+			this.connection = markRaw(os.stream.useChannel('hybridTimeline'));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'global') {
 			endpoint = 'notes/global-timeline';
-			this.connection = os.stream.useChannel('globalTimeline');
+			this.connection = markRaw(os.stream.useChannel('globalTimeline'));
 			this.connection.on('note', prepend);
 		} else if (this.src == 'mentions') {
 			endpoint = 'notes/mentions';
-			this.connection = os.stream.useChannel('main');
+			this.connection = markRaw(os.stream.useChannel('main'));
 			this.connection.on('mention', prepend);
 		} else if (this.src == 'directs') {
 			endpoint = 'notes/mentions';
@@ -159,16 +159,16 @@ export default defineComponent({
 					prepend(note);
 				}
 			};
-			this.connection = os.stream.useChannel('main');
+			this.connection = markRaw(os.stream.useChannel('main'));
 			this.connection.on('mention', onNote);
 		} else if (this.src == 'list') {
 			endpoint = 'notes/user-list-timeline';
 			this.query = {
 				listId: this.list
 			};
-			this.connection = os.stream.useChannel('userList', {
+			this.connection = markRaw(os.stream.useChannel('userList', {
 				listId: this.list
-			});
+			}));
 			this.connection.on('note', prepend);
 			this.connection.on('userAdded', onUserAdded);
 			this.connection.on('userRemoved', onUserRemoved);
@@ -178,9 +178,9 @@ export default defineComponent({
 			this.query = {
 				channelId: this.channel
 			};
-			this.connection = os.stream.useChannel('channel', {
+			this.connection = markRaw(os.stream.useChannel('channel', {
 				channelId: this.channel
-			});
+			}));
 			this.connection.on('note', prepend);
 			this.connection.on('typers', typers => {
 				this.typers = this.$i ? typers.filter(u => u.id !== this.$i.id) : typers;
diff --git a/src/client/widgets/job-queue.vue b/src/client/widgets/job-queue.vue
index 162ffe9c8..beb80f7fa 100644
--- a/src/client/widgets/job-queue.vue
+++ b/src/client/widgets/job-queue.vue
@@ -46,7 +46,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import define from './define';
 import * as os from '@client/os';
 import number from '@client/filters/number';
@@ -65,7 +65,7 @@ export default defineComponent({
 	extends: widget,
 	data() {
 		return {
-			connection: os.stream.useChannel('queueStats'),
+			connection: markRaw(os.stream.useChannel('queueStats')),
 			inbox: {
 				activeSincePrevTick: 0,
 				active: 0,
diff --git a/src/client/widgets/photos.vue b/src/client/widgets/photos.vue
index 7f6fa8272..25365d6b8 100644
--- a/src/client/widgets/photos.vue
+++ b/src/client/widgets/photos.vue
@@ -15,7 +15,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import MkContainer from '@client/components/ui/container.vue';
 import define from './define';
 import { getStaticImageUrl } from '@client/scripts/get-static-image-url';
@@ -48,7 +48,7 @@ export default defineComponent({
 		};
 	},
 	mounted() {
-		this.connection = os.stream.useChannel('main');
+		this.connection = markRaw(os.stream.useChannel('main'));
 
 		this.connection.on('driveFileCreated', this.onDriveFileCreated);
 
diff --git a/src/client/widgets/server-metric/index.vue b/src/client/widgets/server-metric/index.vue
index 2398e9920..45cd8cebf 100644
--- a/src/client/widgets/server-metric/index.vue
+++ b/src/client/widgets/server-metric/index.vue
@@ -14,7 +14,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineComponent, markRaw } from 'vue';
 import define from '../define';
 import MkContainer from '@client/components/ui/container.vue';
 import XCpuMemory from './cpu-mem.vue';
@@ -63,7 +63,7 @@ export default defineComponent({
 		os.api('server-info', {}).then(res => {
 			this.meta = res;
 		});
-		this.connection = os.stream.useChannel('serverStats');
+		this.connection = markRaw(os.stream.useChannel('serverStats'));
 	},
 	unmounted() {
 		this.connection.dispose();