diff --git a/src/client/components/dialog.vue b/src/client/components/dialog.vue
index f157a37ea..f8d700202 100644
--- a/src/client/components/dialog.vue
+++ b/src/client/components/dialog.vue
@@ -169,15 +169,15 @@ export default defineComponent({
 		font-size: 32px;
 
 		&.success {
-			color: var(--accent);
+			color: var(--success);
 		}
 
 		&.error {
-			color: #ec4137;
+			color: var(--error);
 		}
 
 		&.warning {
-			color: #ecb637;
+			color: var(--warn);
 		}
 
 		> * {
diff --git a/src/client/components/taskmanager.vue b/src/client/components/taskmanager.vue
index 29b054d0f..704e2d3e8 100644
--- a/src/client/components/taskmanager.vue
+++ b/src/client/components/taskmanager.vue
@@ -7,7 +7,7 @@
 		<MkTab v-model:value="tab" :items="[{ label: 'Windows', value: 'windows', }, { label: 'Stream', value: 'stream', }, { label: 'Stream (Pool)', value: 'streamPool', }, { label: 'API', value: 'api', }]" style="border-bottom: solid 1px var(--divider);"/>
 
 		<div class="content">
-			<div v-if="tab === 'windows'" class="windows">
+			<div v-if="tab === 'windows'" class="windows" v-follow>
 				<div class="header">
 					<div>#ID</div>
 					<div>Component</div>
@@ -19,7 +19,7 @@
 					<div><button class="_textButton" @click="killPopup(p)">Kill</button></div>
 				</div>
 			</div>
-			<div v-if="tab === 'stream'" class="stream">
+			<div v-if="tab === 'stream'" class="stream" v-follow>
 				<div class="header">
 					<div>#ID</div>
 					<div>Ch</div>
@@ -36,7 +36,7 @@
 					<div>{{ c.out }}</div>
 				</div>
 			</div>
-			<div v-if="tab === 'streamPool'" class="streamPool">
+			<div v-if="tab === 'streamPool'" class="streamPool" v-follow>
 				<div class="header">
 					<div>#ID</div>
 					<div>Ch</div>
@@ -48,6 +48,18 @@
 					<div>{{ p.users }}</div>
 				</div>
 			</div>
+			<div v-if="tab === 'api'" class="api" v-follow>
+				<div class="header">
+					<div>#ID</div>
+					<div>Endpoint</div>
+					<div>State</div>
+				</div>
+				<div v-for="req in apiRequests">
+					<div>#{{ req.id }}</div>
+					<div>{{ req.endpoint }}</div>
+					<div class="state" :class="req.state">{{ req.state }}</div>
+				</div>
+			</div>
 		</div>
 
 		<footer>
@@ -65,6 +77,7 @@ 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 follow from '@/directives/follow-append';
 import * as os from '@/os';
 
 export default defineComponent({
@@ -74,6 +87,10 @@ export default defineComponent({
 		MkButton,
 	},
 
+	directives: {
+		follow
+	},
+
 	props: {
 	},
 
@@ -105,6 +122,7 @@ export default defineComponent({
 		return {
 			tab: ref('stream'),
 			popups: os.popups,
+			apiRequests: os.apiRequests,
 			connections,
 			pools,
 			killPopup,
@@ -125,9 +143,7 @@ export default defineComponent({
 		flex: 1;
 		overflow: auto;
 
-		> .windows,
-		> .stream,
-		> .streamPool {
+		> div {
 			display: table;
 			width: 100%;
 			padding: 16px;
@@ -140,8 +156,31 @@ export default defineComponent({
 					opacity: 0.7;
 				}
 
-				> * {
+				> div {
 					display: table-cell;
+					white-space: nowrap;
+
+					&:not(:last-child) {
+						padding-right: 8px;
+					}
+				}
+			}
+
+			&.api {
+				> div {
+					> .state {
+						&.pending {
+							color: var(--warn);
+						}
+
+						&.success {
+							color: var(--success);
+						}
+
+						&.failed {
+							color: var(--error);
+						}
+					}
 				}
 			}
 		}
diff --git a/src/client/directives/follow-append.ts b/src/client/directives/follow-append.ts
new file mode 100644
index 000000000..26f9e9f82
--- /dev/null
+++ b/src/client/directives/follow-append.ts
@@ -0,0 +1,25 @@
+import { Directive } from 'vue';
+import { getScrollContainer, getScrollPosition } from '@/scripts/scroll';
+
+export default {
+	mounted(src, binding, vn) {
+		const ro = new ResizeObserver((entries, observer) => {
+			const pos = getScrollPosition(src);
+			const container = getScrollContainer(src);
+			const viewHeight = container.clientHeight;
+			const height = container.scrollHeight;
+			if (pos + viewHeight > height - 32) {
+				container.scrollTop = height;
+			}
+		});
+
+		ro.observe(src);
+
+		// TODO: 新たにプロパティを作るのをやめMapを使う
+		src._ro_ = ro;
+	},
+
+	unmounted(src, binding, vn) {
+		src._ro_.unobserve(src);
+	}
+} as Directive;
diff --git a/src/client/os.ts b/src/client/os.ts
index 86fdd21b6..a9b56e60f 100644
--- a/src/client/os.ts
+++ b/src/client/os.ts
@@ -2,7 +2,7 @@ import { Component, defineAsyncComponent, markRaw, reactive, Ref, ref } from 'vu
 import { EventEmitter } from 'eventemitter3';
 import Stream from '@/scripts/stream';
 import { store } from '@/store';
-import { apiUrl } from '@/config';
+import { apiUrl, debug } from '@/config';
 import MkPostFormDialog from '@/components/post-form-dialog.vue';
 import MkWaitingDialog from '@/components/waiting-dialog.vue';
 import { resolve } from '@/router';
@@ -13,28 +13,26 @@ export const isMobile = /mobile|iphone|ipad|android/.test(ua);
 export const stream = markRaw(new Stream());
 
 export const pendingApiRequestsCount = ref(0);
+export const apiRequests = ref([]); // for debug
 
 export const windows = new Map();
 
 export function api(endpoint: string, data: Record<string, any> = {}, token?: string | null | undefined) {
 	pendingApiRequestsCount.value++;
 
-	if (_DEV_) {
-		performance.mark(_PERF_PREFIX_ + 'api:begin');
-	}
-
 	const onFinally = () => {
 		pendingApiRequestsCount.value--;
-
-		if (_DEV_) {
-			performance.mark(_PERF_PREFIX_ + 'api:end');
-
-			performance.measure(_PERF_PREFIX_ + 'api',
-				_PERF_PREFIX_ + 'api:begin',
-				_PERF_PREFIX_ + 'api:end');
-		}
 	};
 
+	const log = debug ? reactive({
+		id: apiRequests.value.length,
+		endpoint,
+		state: 'pending'
+	}) : null;
+	if (debug) {
+		apiRequests.value.push(log);
+	}
+
 	const promise = new Promise((resolve, reject) => {
 		// Append a credential
 		if (store.getters.isSignedIn) (data as any).i = store.state.i.token;
@@ -51,10 +49,19 @@ export function api(endpoint: string, data: Record<string, any> = {}, token?: st
 
 			if (res.status === 200) {
 				resolve(body);
+				if (debug) {
+					log.state = 'success';
+				}
 			} else if (res.status === 204) {
 				resolve();
+				if (debug) {
+					log.state = 'success';
+				}
 			} else {
 				reject(body.error);
+				if (debug) {
+					log.state = 'failed';
+				}
 			}
 		}).catch(reject);
 	});
diff --git a/src/client/pages/test.vue b/src/client/pages/test.vue
index 5a3929d63..bcfe891c8 100644
--- a/src/client/pages/test.vue
+++ b/src/client/pages/test.vue
@@ -10,6 +10,10 @@
 				<MkInput v-model:value="dialogBody">
 					<span>Body</span>
 				</MkInput>
+				<MkRadio v-model="dialogType" value="info">Info</MkRadio>
+				<MkRadio v-model="dialogType" value="success">Success</MkRadio>
+				<MkRadio v-model="dialogType" value="warning">Warn</MkRadio>
+				<MkRadio v-model="dialogType" value="error">Error</MkRadio>
 				<MkSwitch v-model:value="dialogCancel">
 					<span>With cancel button</span>
 				</MkSwitch>
@@ -133,6 +137,7 @@ import MkButton from '@/components/ui/button.vue';
 import MkInput from '@/components/ui/input.vue';
 import MkSwitch from '@/components/ui/switch.vue';
 import MkTextarea from '@/components/ui/textarea.vue';
+import MkRadio from '@/components/ui/radio.vue';
 import * as os from '@/os';
 
 export default defineComponent({
@@ -141,6 +146,7 @@ export default defineComponent({
 		MkInput,
 		MkSwitch,
 		MkTextarea,
+		MkRadio,
 	},
 
 	data() {
@@ -153,6 +159,7 @@ export default defineComponent({
 			},
 			dialogTitle: 'Hello',
 			dialogBody: 'World!',
+			dialogType: 'info',
 			dialogCancel: false,
 			dialogCancelByBgClick: true,
 			dialogInput: false,
@@ -192,6 +199,7 @@ export default defineComponent({
 		async showDialog() {
 			this.dialogResult = null;
 			this.dialogResult = await os.dialog({
+				type: this.dialogType,
 				title: this.dialogTitle,
 				text: this.dialogBody,
 				showCancelButton: this.dialogCancel,
diff --git a/src/client/themes/_dark.json5 b/src/client/themes/_dark.json5
index ce06618ac..ee6d9b49e 100644
--- a/src/client/themes/_dark.json5
+++ b/src/client/themes/_dark.json5
@@ -56,6 +56,9 @@
 		wallpaperOverlay: 'rgba(0, 0, 0, 0.5)',
 		badge: '#31b1ce',
 		messageBg: ':lighten<5<@bg',
+		success: '#86b300',
+		error: '#ec4137',
+		warn: '#ecb637',
 		htmlThemeColor: '@bg',
 		X1: ':alpha<0<@bg',
 		X2: ':darken<2<@panel',
diff --git a/src/client/themes/_light.json5 b/src/client/themes/_light.json5
index 9862e8fdc..882199939 100644
--- a/src/client/themes/_light.json5
+++ b/src/client/themes/_light.json5
@@ -56,6 +56,9 @@
 		wallpaperOverlay: 'rgba(255, 255, 255, 0.5)',
 		badge: '#31b1ce',
 		messageBg: '@panel',
+		success: '#86b300',
+		error: '#ec4137',
+		warn: '#ecb637',
 		htmlThemeColor: '@bg',
 		X1: ':alpha<0<@bg',
 		X2: ':darken<2<@panel',