diff --git a/packages/client/src/components/taskmanager.api-window.vue b/packages/client/src/components/taskmanager.api-window.vue
deleted file mode 100644
index 6ec4da3a5..000000000
--- a/packages/client/src/components/taskmanager.api-window.vue
+++ /dev/null
@@ -1,72 +0,0 @@
-<template>
-<XWindow ref="window"
-	:initial-width="370"
-	:initial-height="450"
-	:can-resize="true"
-	@close="$refs.window.close()"
-	@closed="$emit('closed')"
->
-	<template #header>Req Viewer</template>
-
-	<div class="rlkneywz">
-		<MkTab v-model="tab" style="border-bottom: solid 0.5px var(--divider);">
-			<option value="req">Request</option>
-			<option value="res">Response</option>
-		</MkTab>
-
-		<code v-if="tab === 'req'" class="_monospace">{{ reqStr }}</code>
-		<code v-if="tab === 'res'" class="_monospace">{{ resStr }}</code>
-	</div>
-</XWindow>
-</template>
-
-<script lang="ts">
-import { defineComponent } from 'vue';
-import * as JSON5 from 'json5';
-import XWindow from '@/components/ui/window.vue';
-import MkTab from '@/components/tab.vue';
-
-export default defineComponent({
-	components: {
-		XWindow,
-		MkTab,
-	},
-
-	props: {
-		req: {
-			required: true,
-		}
-	},
-
-	emits: ['closed'],
-
-	data() {
-		return {
-			tab: 'req',
-			reqStr: JSON5.stringify(this.req.req, null, '\t'),
-			resStr: JSON5.stringify(this.req.res, null, '\t'),
-		}
-	},
-
-	methods: {
-	}
-});
-</script>
-
-<style lang="scss" scoped>
-.rlkneywz {
-	display: flex;
-	flex-direction: column;
-	height: 100%;
-
-	> code {
-		display: block;
-		flex: 1;
-		padding: 8px;
-		overflow: auto;
-		font-size: 0.9em;
-		tab-size: 2;
-		white-space: pre;
-	}
-}
-</style>
diff --git a/packages/client/src/components/taskmanager.vue b/packages/client/src/components/taskmanager.vue
deleted file mode 100644
index c5d2c6d8f..000000000
--- a/packages/client/src/components/taskmanager.vue
+++ /dev/null
@@ -1,234 +0,0 @@
-<template>
-<XWindow ref="window" :initial-width="650" :initial-height="420" :can-resize="true" @closed="$emit('closed')">
-	<template #header>
-		<i class="fas fa-terminal" style="margin-right: 0.5em;"></i>Task Manager
-	</template>
-	<div class="qljqmnzj _monospace">
-		<MkTab v-model="tab" style="border-bottom: solid 0.5px var(--divider);">
-			<option value="windows">Windows</option>
-			<option value="stream">Stream</option>
-			<option value="streamPool">Stream (Pool)</option>
-			<option value="api">API</option>
-		</MkTab>
-
-		<div class="content">
-			<div v-if="tab === 'windows'" v-follow class="windows">
-				<div class="header">
-					<div>#ID</div>
-					<div>Component</div>
-					<div>Action</div>
-				</div>
-				<div v-for="p in popups">
-					<div>#{{ p.id }}</div>
-					<div>{{ p.component.name ? p.component.name : '<anonymous>' }}</div>
-					<div><button class="_textButton" @click="killPopup(p)">Kill</button></div>
-				</div>
-			</div>
-			<div v-if="tab === 'stream'" v-follow 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 v-if="tab === 'streamPool'" v-follow class="streamPool">
-				<div class="header">
-					<div>#ID</div>
-					<div>Ch</div>
-					<div>Users</div>
-				</div>
-				<div v-for="p in pools">
-					<div>#{{ p.id }}</div>
-					<div>{{ p.channel }}</div>
-					<div>{{ p.users }}</div>
-				</div>
-			</div>
-			<div v-if="tab === 'api'" v-follow class="api">
-				<div class="header">
-					<div>#ID</div>
-					<div>Endpoint</div>
-					<div>State</div>
-				</div>
-				<div v-for="req in apiRequests" @click="showReq(req)">
-					<div>#{{ req.id }}</div>
-					<div>{{ req.endpoint }}</div>
-					<div class="state" :class="req.state">{{ req.state }}</div>
-				</div>
-			</div>
-		</div>
-
-		<footer>
-			<div><span class="label">Windows</span>{{ popups.length }}</div>
-			<div><span class="label">Stream</span>{{ connections.length }}</div>
-			<div><span class="label">Stream (Pool)</span>{{ pools.length }}</div>
-		</footer>
-	</div>
-</XWindow>
-</template>
-
-<script lang="ts">
-import { defineComponent, markRaw, onBeforeUnmount, ref, shallowRef } from 'vue';
-import XWindow from '@/components/ui/window.vue';
-import MkTab from '@/components/tab.vue';
-import MkButton from '@/components/ui/button.vue';
-import follow from '@/directives/follow-append';
-import * as os from '@/os';
-import { stream } from '@/stream';
-
-export default defineComponent({
-	components: {
-		XWindow,
-		MkTab,
-		MkButton,
-	},
-
-	directives: {
-		follow
-	},
-
-	props: {
-	},
-
-	emits: ['closed'],
-
-	setup() {
-		const connections = shallowRef([]);
-		const pools = shallowRef([]);
-		const refreshStreamInfo = () => {
-			console.log(stream.sharedConnectionPools, stream.sharedConnections, stream.nonSharedConnections);
-			const conn = stream.sharedConnections.map(c => ({
-				id: c.id, name: c.name, channel: c.channel, users: c.pool.users, in: c.inCount, out: c.outCount,
-			})).concat(stream.nonSharedConnections.map(c => ({
-				id: c.id, name: c.name, channel: c.channel, users: null, in: c.inCount, out: c.outCount,
-			})));
-			conn.sort((a, b) => (a.id > b.id) ? 1 : -1);
-			connections.value = conn;
-			pools.value = stream.sharedConnectionPools;
-		};
-		const interval = setInterval(refreshStreamInfo, 1000);
-		onBeforeUnmount(() => {
-			clearInterval(interval);
-		});
-
-		const killPopup = p => {
-			os.popups.value = os.popups.value.filter(x => x !== p);
-		};
-
-		const showReq = req => {
-			os.popup(import('./taskmanager.api-window.vue'), {
-				req: req
-			}, {
-			}, 'closed');
-		};
-
-		return {
-			tab: ref('stream'),
-			popups: os.popups,
-			apiRequests: os.apiRequests,
-			connections,
-			pools,
-			killPopup,
-			showReq,
-		};
-	},
-});
-</script>
-
-<style lang="scss" scoped>
-.qljqmnzj {
-	display: flex;
-	flex-direction: column;
-	height: 100%;
-
-	> .content {
-		flex: 1;
-		overflow: auto;
-
-		> div {
-			display: table;
-			width: 100%;
-			padding: 16px;
-			box-sizing: border-box;
-
-			> div {
-				display: table-row;
-
-				&:nth-child(even) {
-					//background: rgba(0, 0, 0, 0.1);
-				}
-
-				&.header {
-					opacity: 0.7;
-				}
-
-				> div {
-					display: table-cell;
-					white-space: nowrap;
-
-					&:not(:last-child) {
-						padding-right: 8px;
-					}
-				}
-			}
-
-			&.api {
-				> div {
-					&:not(.header) {
-						cursor: pointer;
-
-						&:hover {
-							color: var(--accent);
-						}
-					}
-
-					> .state {
-						&.pending {
-							color: var(--warn);
-						}
-
-						&.success {
-							color: var(--success);
-						}
-
-						&.failed {
-							color: var(--error);
-						}
-					}
-				}
-			}
-		}
-	}
-
-	> footer {
-		display: flex;
-		width: 100%;
-		padding: 8px 16px;
-		box-sizing: border-box;
-		border-top: solid 0.5px var(--divider);
-		font-size: 0.9em;
-
-		> div {
-			flex: 1;
-
-			> .label {
-				opacity: 0.7;
-				margin-right: 0.5em;
-
-				&:after {
-					content: ":";
-				}
-			}
-		}
-	}
-}
-</style>
diff --git a/packages/client/src/os.ts b/packages/client/src/os.ts
index d9400103f..e6dd4567f 100644
--- a/packages/client/src/os.ts
+++ b/packages/client/src/os.ts
@@ -4,16 +4,13 @@ import { Component, defineAsyncComponent, markRaw, reactive, Ref, ref } from 'vu
 import { EventEmitter } from 'eventemitter3';
 import insertTextAtCursor from 'insert-text-at-cursor';
 import * as Misskey from 'misskey-js';
-import { apiUrl, debug, url } from '@/config';
+import { apiUrl, url } from '@/config';
 import MkPostFormDialog from '@/components/post-form-dialog.vue';
 import MkWaitingDialog from '@/components/waiting-dialog.vue';
 import { resolve } from '@/router';
 import { $i } from '@/account';
-import { defaultStore } from '@/store';
 
 export const pendingApiRequestsCount = ref(0);
-let apiRequestsCount = 0; // for debug
-export const apiRequests = ref([]); // for debug
 
 const apiClient = new Misskey.api.APIClient({
 	origin: url,
@@ -26,18 +23,6 @@ export const api = ((endpoint: string, data: Record<string, any> = {}, token?: s
 		pendingApiRequestsCount.value--;
 	};
 
-	const log = debug ? reactive({
-		id: ++apiRequestsCount,
-		endpoint,
-		req: markRaw(data),
-		res: null,
-		state: 'pending',
-	}) : null;
-	if (debug) {
-		apiRequests.value.push(log);
-		if (apiRequests.value.length > 128) apiRequests.value.shift();
-	}
-
 	const promise = new Promise((resolve, reject) => {
 		// Append a credential
 		if ($i) (data as any).i = $i.token;
@@ -54,21 +39,10 @@ export const api = ((endpoint: string, data: Record<string, any> = {}, token?: s
 
 			if (res.status === 200) {
 				resolve(body);
-				if (debug) {
-					log!.res = markRaw(JSON.parse(JSON.stringify(body)));
-					log!.state = 'success';
-				}
 			} else if (res.status === 204) {
 				resolve();
-				if (debug) {
-					log!.state = 'success';
-				}
 			} else {
 				reject(body.error);
-				if (debug) {
-					log!.res = markRaw(body.error);
-					log!.state = 'failed';
-				}
 			}
 		}).catch(reject);
 	});
diff --git a/packages/client/src/pages/settings/other.vue b/packages/client/src/pages/settings/other.vue
index acc1fb4d3..754701383 100644
--- a/packages/client/src/pages/settings/other.vue
+++ b/packages/client/src/pages/settings/other.vue
@@ -63,11 +63,6 @@ export default defineComponent({
 				injectFeaturedNote: v
 			});
 		},
-
-		taskmanager() {
-			os.popup(import('@/components/taskmanager.vue'), {
-			}, {}, 'closed');
-		},
 	}
 });
 </script>