diff --git a/src/client/components/taskmanager.vue b/src/client/components/taskmanager.vue
new file mode 100644
index 000000000..14d4e2d1b
--- /dev/null
+++ b/src/client/components/taskmanager.vue
@@ -0,0 +1,96 @@
+<template>
+<XWindow ref="window" :initial-width="650" :initial-height="420" :can-resize="true" @closed="$emit('closed')">
+	<template #header>
+		<Fa :icon="faTerminal" style="margin-right: 0.5em;"/>Task Manager
+	</template>
+	<div class="qljqmnzj">
+		<MkTab v-model:value="tab" :items="[{ label: 'Stream', value: 'stream', }, { label: 'API', value: 'api', }]"/>
+		<div v-if="tab === 'stream'" class="stream">
+			<div class="header">
+				<div>#ID</div>
+				<div>Ch</div>
+				<div>Handle</div>
+				<div>In</div>
+				<div>Out</div>
+			</div>
+			<div v-for="c in connections">
+				<div>#{{ c.id }}</div>
+				<div>{{ c.channel }}</div>
+				<div v-if="c.users !== null">(shared)<span v-if="c.name">{{ ' ' + c.name }}</span></div>
+				<div v-else>{{ c.name ? c.name : '<anonymous>' }}</div>
+				<div>{{ c.in }}</div>
+				<div>{{ c.out }}</div>
+			</div>
+		</div>
+	</div>
+</XWindow>
+</template>
+
+<script lang="ts">
+import { defineComponent, markRaw, onBeforeUnmount, ref } from 'vue';
+import { faTerminal } from '@fortawesome/free-solid-svg-icons';
+import XWindow from '@/components/ui/window.vue';
+import MkTab from '@/components/tab.vue';
+import MkButton from '@/components/ui/button.vue';
+import * as os from '@/os';
+
+export default defineComponent({
+	components: {
+		XWindow,
+		MkTab,
+		MkButton,
+	},
+
+	props: {
+	},
+
+	emits: ['closed'],
+
+	setup() {
+		const connections = ref([]);
+		const refreshStreamInfo = () => {
+			console.log(os.stream.sharedConnections, os.stream.nonSharedConnections);
+			connections.value = markRaw(os.stream.sharedConnections.map(c => ({
+				id: c.id, name: c.name, channel: c.channel, users: c.pool.users, in: c.inCount, out: c.outCount,
+			})).concat(os.stream.nonSharedConnections.map(c => ({
+				id: c.id, name: c.name, channel: c.channel, users: null, in: c.inCount, out: c.outCount,
+			}))));
+			connections.value.sort((a, b) => (a.id > b.id) ? 1 : -1);
+		};
+		const interval = setInterval(refreshStreamInfo, 1000);
+		onBeforeUnmount(() => {
+			clearInterval(interval);
+		});
+
+		return {
+			tab: 'stream',
+			connections,
+			faTerminal,
+		};
+	},
+});
+</script>
+
+<style lang="scss" scoped>
+.qljqmnzj {
+	> .stream {
+		display: table;
+		width: 100%;
+		padding: 8px;
+		box-sizing: border-box;
+
+		> div {
+			display: table-row;
+			font-family: Fira code, Fira Mono, Consolas, Menlo, Courier, monospace;
+
+			&.header {
+				opacity: 0.7;
+			}
+
+			> * {
+				display: table-cell;
+			}
+		}
+	}
+}
+</style>
diff --git a/src/client/config.ts b/src/client/config.ts
index e0d2fd1de..9c5e0f765 100644
--- a/src/client/config.ts
+++ b/src/client/config.ts
@@ -14,3 +14,4 @@ export const getLocale = async () => Object.fromEntries((await entries(clientDb.
 export const version = _VERSION_;
 export const instanceName = siteName === 'Misskey' ? host : siteName;
 export const deckmode = localStorage.getItem('deckmode') === 'true';
+export const debug = localStorage.getItem('debug') === 'true';
diff --git a/src/client/init.ts b/src/client/init.ts
index 86991b69e..070deec0c 100644
--- a/src/client/init.ts
+++ b/src/client/init.ts
@@ -252,7 +252,7 @@ if (store.getters.isSignedIn) {
 		}
 	}
 
-	const main = stream.useSharedConnection('main');
+	const main = stream.useSharedConnection('main', 'system');
 
 	// 自分の情報が更新されたとき
 	main.on('meUpdated', i => {
diff --git a/src/client/pages/settings/other.vue b/src/client/pages/settings/other.vue
index 38c2e8adb..dbeb9ad71 100644
--- a/src/client/pages/settings/other.vue
+++ b/src/client/pages/settings/other.vue
@@ -10,22 +10,31 @@
 		</div>
 	</div>
 	<div class="_section">
-		<MkA to="/settings/regedit">RegEdit</MkA>
+		<MkSwitch v-model:value="debug" @update:value="changeDebug">
+			DEBUG MODE
+		</MkSwitch>
+		<div v-if="debug">
+			<MkA to="/settings/regedit">RegEdit</MkA>
+			<MkButton @click="taskmanager">Task Manager</MkButton>
+		</div>
 	</div>
 </div>
 </template>
 
 <script lang="ts">
-import { defineComponent } from 'vue';
+import { defineAsyncComponent, defineComponent } from 'vue';
 import { faEllipsisH } from '@fortawesome/free-solid-svg-icons';
 import MkSelect from '@/components/ui/select.vue';
 import MkSwitch from '@/components/ui/switch.vue';
+import MkButton from '@/components/ui/button.vue';
 import * as os from '@/os';
+import { debug } from '@/config';
 
 export default defineComponent({
 	components: {
 		MkSelect,
 		MkSwitch,
+		MkButton,
 	},
 
 	emits: ['info'],
@@ -38,6 +47,7 @@ export default defineComponent({
 					icon: faEllipsisH
 				}]
 			},
+			debug
 		}
 	},
 
@@ -46,11 +56,22 @@ export default defineComponent({
 	},
 
 	methods: {
+		changeDebug(v) {
+			console.log(v);
+			localStorage.setItem('debug', v.toString());
+			location.reload();
+		},
+
 		onChangeInjectFeaturedNote(v) {
 			os.api('i/update', {
 				injectFeaturedNote: v
 			});
 		},
+
+		taskmanager() {
+			os.popup(defineAsyncComponent(() => import('@/components/taskmanager.vue')), {
+			}, {}, 'closed');
+		}
 	}
 });
 </script>
diff --git a/src/client/scripts/stream.ts b/src/client/scripts/stream.ts
index 789bf9432..942e2a8da 100644
--- a/src/client/scripts/stream.ts
+++ b/src/client/scripts/stream.ts
@@ -1,7 +1,7 @@
 import autobind from 'autobind-decorator';
 import { EventEmitter } from 'eventemitter3';
 import ReconnectingWebsocket from 'reconnecting-websocket';
-import { wsUrl } from '@/config';
+import { debug, wsUrl } from '@/config';
 import { query as urlQuery } from '../../prelude/url';
 
 /**
@@ -28,7 +28,7 @@ export default class Stream extends EventEmitter {
 	}
 
 	@autobind
-	public useSharedConnection(channel: string): SharedConnection {
+	public useSharedConnection(channel: string, name?: string): SharedConnection {
 		let pool = this.sharedConnectionPools.find(p => p.channel === channel);
 
 		if (pool == null) {
@@ -36,7 +36,7 @@ export default class Stream extends EventEmitter {
 			this.sharedConnectionPools.push(pool);
 		}
 
-		const connection = new SharedConnection(this, channel, pool);
+		const connection = new SharedConnection(this, channel, pool, name);
 		this.sharedConnections.push(connection);
 		return connection;
 	}
@@ -113,6 +113,7 @@ export default class Stream extends EventEmitter {
 
 			for (const c of connections.filter(c => c != null)) {
 				c.emit(body.type, Object.freeze(body.body));
+				if (debug) c.inCount++;
 			}
 		} else {
 			this.emit(type, Object.freeze(body));
@@ -142,6 +143,8 @@ export default class Stream extends EventEmitter {
 	}
 }
 
+let idCounter = 0;
+
 class Pool {
 	public channel: string;
 	public id: string;
@@ -154,7 +157,7 @@ class Pool {
 		this.channel = channel;
 		this.stream = stream;
 
-		this.id = Math.random().toString().substr(2, 8);
+		this.id = (++idCounter).toString();
 
 		this.stream.on('_disconnected_', this.onStreamDisconnected);
 	}
@@ -216,11 +219,16 @@ abstract class Connection extends EventEmitter {
 	protected stream: Stream;
 	public abstract id: string;
 
-	constructor(stream: Stream, channel: string) {
+	public name?: string; // for debug
+	public inCount: number = 0; // for debug
+	public outCount: number = 0; // for debug
+
+	constructor(stream: Stream, channel: string, name?: string) {
 		super();
 
 		this.stream = stream;
 		this.channel = channel;
+		this.name = name;
 	}
 
 	@autobind
@@ -233,6 +241,8 @@ abstract class Connection extends EventEmitter {
 			type: type,
 			body: body
 		});
+
+		if (debug) this.outCount++;
 	}
 
 	public abstract dispose(): void;
@@ -245,8 +255,8 @@ class SharedConnection extends Connection {
 		return this.pool.id;
 	}
 
-	constructor(stream: Stream, channel: string, pool: Pool) {
-		super(stream, channel);
+	constructor(stream: Stream, channel: string, pool: Pool, name?: string) {
+		super(stream, channel, name);
 
 		this.pool = pool;
 		this.pool.inc();
@@ -273,7 +283,7 @@ class NonSharedConnection extends Connection {
 		super(stream, channel);
 
 		this.params = params;
-		this.id = Math.random().toString().substr(2, 8);
+		this.id = (++idCounter).toString();
 
 		this.connect();
 	}