diff --git a/locales/en-US.yml b/locales/en-US.yml
index d682712f67..6244267e5f 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -2241,4 +2241,5 @@ incorrectLanguageWarning: "It looks like your post is in {detected}, but you sel
 noteEditHistory: "Post edit history"
 slashQuote: "Chain quote"
 foldNotification: "Group similar notifications"
-collapseReplyInTimeline: "Collapse replied posts in timeline"
+mergeThreadInTimeline: "Merge posts in timeline into threads if possible"
+mergeRenotesInTimeline: "Merge boosts"
diff --git a/locales/zh-CN.yml b/locales/zh-CN.yml
index 662bbd5ab3..464f186ea5 100644
--- a/locales/zh-CN.yml
+++ b/locales/zh-CN.yml
@@ -2068,4 +2068,5 @@ noteEditHistory: "帖子编辑历史"
 media: 媒体
 slashQuote: "斜杠引用"
 foldNotification: "将通知按同类型分组"
-collapseReplyInTimeline: "折叠显示时间线里被回复的帖子"
+mergeThreadInTimeline: "将时间线内的连续回复合并成一串"
+mergeRenotesInTimeline: "合并转发"
diff --git a/packages/client/src/components/MkNote.vue b/packages/client/src/components/MkNote.vue
index 3d5d6d59b5..a712bf4d8b 100644
--- a/packages/client/src/components/MkNote.vue
+++ b/packages/client/src/components/MkNote.vue
@@ -1,7 +1,7 @@
 <template>
 	<div
 		v-if="!muted.muted"
-		v-show="!isDeleted"
+		v-show="!isDeleted && renotes?.length !== 0"
 		:id="appearNote.historyId || appearNote.id"
 		ref="el"
 		v-hotkey="keymap"
@@ -10,13 +10,20 @@
 		:aria-label="accessibleLabel"
 		class="tkcbzcuz note-container"
 		:tabindex="!isDeleted ? '-1' : undefined"
-		:class="{ renote: isRenote }"
+		:class="{ renote: isRenote || (renotesSliced && renotesSliced.length > 0) }"
 	>
 		<MkNoteSub
-			v-if="appearNote.reply && !detailedView && !collapsedReply"
+			v-if="appearNote.reply && !detailedView && !collapsedReply && !parents"
 			:note="appearNote.reply"
 			class="reply-to"
 		/>
+		<MkNoteSub
+			v-else-if="!detailedView && !collapsedReply && parents"
+			v-for="n of parents"
+			:key="n.id"
+			:note="n"
+			class="reply-to"
+		/>
 		<div
 			v-if="!detailedView"
 			class="note-context"
@@ -41,35 +48,6 @@
 			<div v-if="pinned" class="info">
 				<i :class="icon('ph-push-pin')"></i>{{ i18n.ts.pinnedNote }}
 			</div>
-			<div v-if="isRenote" class="renote">
-				<i :class="icon('ph-rocket-launch')"></i>
-				<I18n :src="i18n.ts.renotedBy" tag="span">
-					<template #user>
-						<MkA
-							v-user-preview="note.userId"
-							class="name"
-							:to="userPage(note.user)"
-							@click.stop
-						>
-							<MkUserName :user="note.user" />
-						</MkA>
-					</template>
-				</I18n>
-				<div class="info">
-					<button
-						ref="renoteTime"
-						class="_button time"
-						@click.stop="showRenoteMenu()"
-					>
-						<i
-							v-if="isMyRenote"
-							:class="icon('ph-dots-three-outline dropdownIcon')"
-						></i>
-						<MkTime :time="note.createdAt" />
-					</button>
-					<MkVisibility :note="note" />
-				</div>
-			</div>
 			<div v-if="collapsedReply && appearNote.reply" class="info">
 				<MkAvatar class="avatar" :user="appearNote.reply.user" />
 				<MkUserName
@@ -85,6 +63,71 @@
 					:custom-emojis="note.emojis"
 				/>
 			</div>
+			<div v-if="isRenote || (renotesSliced && renotesSliced.length > 0)" class="renote">
+				<i :class="icon('ph-rocket-launch')"></i>
+				<I18n
+					v-if="renotesSliced == null"
+					:src="i18n.ts.renotedBy"
+					tag="span"
+				>
+					<template #user>
+						<MkAvatar class="avatar" :user="note.user" />
+						<MkA
+							v-user-preview="note.userId"
+							class="name"
+							:to="userPage(note.user)"
+							@click.stop
+						>
+							<MkUserName :user="note.user" />
+						</MkA>
+					</template>
+				</I18n>
+				<I18n
+					v-else
+					:src="i18n.ts.renotedBy"
+					tag="span"
+				>
+					<template #user>
+						<template
+							v-for="(renote, index) in renotesSliced"
+						>
+							<MkAvatar
+								class="avatar"
+								:user="renote.user"
+							/>
+							<MkA
+								v-user-preview="renote.userId"
+								class="name"
+								:to="userPage(renote.user)"
+								@click.stop
+							>
+								<MkUserName :user="renote.user" />
+							</MkA>
+							{{
+								index !== renotesSliced.length - 1
+									? ", "
+									: renotesSliced.length < renotes!.length
+										? "..."
+										: ""
+							}}
+						</template>
+					</template>
+				</I18n>
+				<div class="info">
+					<button
+						ref="renoteTime"
+						class="_button time"
+						@click.stop="showRenoteMenu()"
+					>
+						<i
+							v-if="isMyNote"
+							:class="icon('ph-dots-three-outline dropdownIcon')"
+						></i>
+						<MkTime :time="note.createdAt" />
+					</button>
+					<MkVisibility :note="note" />
+				</div>
+			</div>
 		</div>
 		<article
 			class="article"
@@ -279,7 +322,7 @@
 </template>
 
 <script lang="ts" setup>
-import { computed, inject, onMounted, ref } from "vue";
+import { computed, inject, onMounted, ref, watch } from "vue";
 import type { Ref } from "vue";
 import type { entities } from "firefish-js";
 import MkSubNoteContent from "./MkSubNoteContent.vue";
@@ -310,17 +353,13 @@ import { notePage } from "@/filters/note";
 import { deepClone } from "@/scripts/clone";
 import { getNoteSummary } from "@/scripts/get-note-summary";
 import icon from "@/scripts/icon";
-import type { NoteTranslation } from "@/types/note";
-
-const router = useRouter();
-
-type NoteType = entities.Note & {
-	_featuredId_?: string;
-	_prId_?: string;
-};
+import type { NoteTranslation, NoteType } from "@/types/note";
+import { isRenote as _isRenote, isDeleted as _isDeleted } from "@/scripts/note";
 
 const props = defineProps<{
 	note: NoteType;
+	parents?: NoteType[];
+	renotes?: entities.Note[];
 	pinned?: boolean;
 	detailedView?: boolean;
 	collapsedReply?: boolean;
@@ -329,37 +368,20 @@ const props = defineProps<{
 	isLongJudger?: (note: entities.Note) => boolean;
 }>();
 
+//#region Constants
+const router = useRouter();
 const inChannel = inject("inChannel", null);
-
-const note = ref(deepClone(props.note));
-
-const softMuteReasonI18nSrc = (what?: string) => {
-	if (what === "note") return i18n.ts.userSaysSomethingReason;
-	if (what === "reply") return i18n.ts.userSaysSomethingReasonReply;
-	if (what === "renote") return i18n.ts.userSaysSomethingReasonRenote;
-	if (what === "quote") return i18n.ts.userSaysSomethingReasonQuote;
-
-	// I don't think here is reachable, but just in case
-	return i18n.ts.userSaysSomething;
+const keymap = {
+	r: () => reply(true),
+	"e|a|plus": () => react(true),
+	q: () => renoteButton.value!.renote(true),
+	"up|k": focusBefore,
+	"down|j": focusAfter,
+	esc: blur,
+	"m|o": () => menu(true),
+	// FIXME: What's this?
+	// s: () => showContent.value !== showContent.value,
 };
-
-// plugin
-if (noteViewInterruptors.length > 0) {
-	onMounted(async () => {
-		let result = deepClone(note.value);
-		for (const interruptor of noteViewInterruptors) {
-			result = await interruptor.handler(result);
-		}
-		note.value = result;
-	});
-}
-
-const isRenote =
-	note.value.renote != null &&
-	note.value.text == null &&
-	note.value.fileIds.length === 0 &&
-	note.value.poll == null;
-
 const el = ref<HTMLElement | null>(null);
 const footerEl = ref<HTMLElement>();
 const menuButton = ref<HTMLElement>();
@@ -367,42 +389,179 @@ const starButton = ref<InstanceType<typeof XStarButton>>();
 const renoteButton = ref<InstanceType<typeof XRenoteButton> | null>(null);
 const renoteTime = ref<HTMLElement>();
 const reactButton = ref<HTMLElement | null>(null);
-const appearNote = computed(() =>
-	isRenote ? (note.value.renote as NoteType) : note.value,
-);
-const isMyRenote = isSignedIn(me) && me.id === note.value.userId;
-// const showContent = ref(false);
-const isDeleted = ref(false);
-const muted = ref(
-	getWordSoftMute(
-		note.value,
-		me?.id,
-		defaultStore.state.mutedWords,
-		defaultStore.state.mutedLangs,
-	),
-);
-const translation = ref<NoteTranslation | null>(null);
-const translating = ref(false);
-const enableEmojiReactions = defaultStore.state.enableEmojiReactions;
-const expandOnNoteClick = defaultStore.state.expandOnNoteClick;
+const enableEmojiReactions = defaultStore.reactiveState.enableEmojiReactions;
+const expandOnNoteClick = defaultStore.reactiveState.expandOnNoteClick;
 const lang = localStorage.getItem("lang");
 const translateLang = localStorage.getItem("translateLang");
 const targetLang = (translateLang || lang || navigator.language)?.slice(0, 2);
+const currentClipPage = inject<Ref<entities.Clip> | null>(
+	"currentClipPage",
+	null,
+);
+//#endregion
 
-const isForeignLanguage: boolean =
-	defaultStore.state.detectPostLanguage &&
-	appearNote.value.text != null &&
-	(() => {
-		const postLang = detectLanguage(appearNote.value.text);
-		return postLang !== "" && postLang !== targetLang;
-	})();
+//#region Variables bound to Notes
+let capture: ReturnType<typeof useNoteCapture> | undefined;
+const note = ref(deepClone(props.note));
+const postIsExpanded = ref(false);
+const translation = ref<NoteTranslation | null>(null);
+const translating = ref(false);
+const isDeleted = ref(false);
+const renotes = ref(props.renotes?.filter((rn) => !_isDeleted(rn.id)));
+//#endregion
 
+//#region computed
+
+const renotesSliced = computed(() => renotes.value?.slice(0, 5));
+
+const isRenote = computed(() => _isRenote(note.value));
+const appearNote = computed(() =>
+	isRenote.value ? (note.value.renote as NoteType) : note.value,
+);
+const isMyNote = computed(
+	() => isSignedIn(me) && me.id === note.value.userId && props.renotes == null,
+);
+const muted = computed(() =>
+	getWordSoftMute(
+		note.value,
+		me?.id,
+		defaultStore.reactiveState.mutedWords.value,
+		defaultStore.reactiveState.mutedLangs.value,
+	),
+);
+const isForeignLanguage = computed(
+	() =>
+		defaultStore.state.detectPostLanguage &&
+		appearNote.value.text != null &&
+		(() => {
+			const postLang = detectLanguage(appearNote.value.text);
+			return postLang !== "" && postLang !== targetLang;
+		})(),
+);
 const reactionCount = computed(() =>
 	Object.values(appearNote.value.reactions).reduce(
 		(partialSum, val) => partialSum + val,
 		0,
 	),
 );
+const accessibleLabel = computed(() => {
+	let label = `${appearNote.value.user.username}; `;
+	if (appearNote.value.renote) {
+		label += `${i18n.ts.renoted} ${appearNote.value.renote.user.username}; `;
+		if (appearNote.value.renote.cw) {
+			label += `${i18n.ts.cw}: ${appearNote.value.renote.cw}; `;
+			if (postIsExpanded.value) {
+				label += `${appearNote.value.renote.text}; `;
+			}
+		} else {
+			label += `${appearNote.value.renote.text}; `;
+		}
+	} else {
+		if (appearNote.value.cw) {
+			label += `${i18n.ts.cw}: ${appearNote.value.cw}; `;
+			if (postIsExpanded.value) {
+				label += `${appearNote.value.text}; `;
+			}
+		} else {
+			label += `${appearNote.value.text}; `;
+		}
+	}
+	const date = new Date(appearNote.value.createdAt);
+	label += `${date.toLocaleTimeString()}`;
+	return label;
+});
+//#endregion
+
+async function pluginInit(newNote: NoteType) {
+	// plugin
+	if (noteViewInterruptors.length > 0) {
+		let result = deepClone(newNote);
+		for (const interruptor of noteViewInterruptors) {
+			result = await interruptor.handler(result);
+		}
+		note.value = result;
+	}
+}
+
+function recalculateRenotes() {
+	renotes.value = props.renotes?.filter((rn) => !_isDeleted(rn.id));
+}
+
+async function init(newNote: NoteType, first = false) {
+	if (!first) {
+		// plugin
+		if (noteViewInterruptors.length > 0) {
+			await pluginInit(newNote);
+		} else {
+			note.value = deepClone(newNote);
+		}
+	}
+
+	translation.value = null;
+	translating.value = false;
+	postIsExpanded.value = false;
+	isDeleted.value = _isDeleted(note.value.id);
+	if (appearNote.value.historyId == null) {
+		capture?.close();
+		capture = useNoteCapture({
+			rootEl: el,
+			note: appearNote,
+			isDeletedRef: isDeleted,
+		});
+		if (isRenote.value === true) {
+			useNoteCapture({
+				rootEl: el,
+				note,
+				isDeletedRef: isDeleted,
+			});
+		}
+		if (props.renotes) {
+			const renoteDeletedTrigger = ref(false);
+			for (const renote of props.renotes) {
+				useNoteCapture({
+					rootEl: el,
+					note: ref(renote),
+					isDeletedRef: renoteDeletedTrigger,
+				});
+			}
+			watch(renoteDeletedTrigger, recalculateRenotes);
+		}
+	}
+}
+
+init(props.note, true);
+
+onMounted(() => {
+	pluginInit(note.value);
+});
+
+watch(isDeleted, () => {
+	if (isDeleted.value === true) {
+		if (props.parents && props.parents.length > 0) {
+			let noteTakePlace: NoteType | null = null;
+			while (noteTakePlace == null || _isDeleted(noteTakePlace.id)) {
+				if (props.parents.length === 0) {
+					return;
+				}
+				noteTakePlace = props.parents[props.parents.length - 1];
+				props.parents.pop();
+			}
+			noteTakePlace.repliesCount -= 1;
+			init(noteTakePlace);
+			isDeleted.value = false;
+		}
+	}
+});
+
+watch(
+	() => props.note.id,
+	(o, n) => {
+		if (o !== n && _isDeleted(note.value.id) !== true) {
+			init(props.note);
+		}
+	},
+);
+watch(() => props.renotes?.length, recalculateRenotes);
 
 async function translate_(noteId: string, targetLang: string) {
 	return await os.api("notes/translate", {
@@ -431,24 +590,14 @@ async function translate() {
 	translating.value = false;
 }
 
-const keymap = {
-	r: () => reply(true),
-	"e|a|plus": () => react(true),
-	q: () => renoteButton.value!.renote(true),
-	"up|k": focusBefore,
-	"down|j": focusAfter,
-	esc: blur,
-	"m|o": () => menu(true),
-	// FIXME: What's this?
-	// s: () => showContent.value !== showContent.value,
-};
+function softMuteReasonI18nSrc(what?: string) {
+	if (what === "note") return i18n.ts.userSaysSomethingReason;
+	if (what === "reply") return i18n.ts.userSaysSomethingReasonReply;
+	if (what === "renote") return i18n.ts.userSaysSomethingReasonRenote;
+	if (what === "quote") return i18n.ts.userSaysSomethingReasonQuote;
 
-if (appearNote.value.historyId == null) {
-	useNoteCapture({
-		rootEl: el,
-		note: appearNote,
-		isDeletedRef: isDeleted,
-	});
+	// I don't think here is reachable, but just in case
+	return i18n.ts.userSaysSomething;
 }
 
 function reply(_viaKeyboard = false): void {
@@ -489,11 +638,6 @@ function undoReact(note: NoteType): void {
 	});
 }
 
-const currentClipPage = inject<Ref<entities.Clip> | null>(
-	"currentClipPage",
-	null,
-);
-
 function onContextmenu(ev: MouseEvent): void {
 	const isLink = (el: HTMLElement): boolean => {
 		if (el.tagName === "A") return true;
@@ -582,7 +726,7 @@ function menu(viaKeyboard = false): void {
 }
 
 function showRenoteMenu(viaKeyboard = false): void {
-	if (!isMyRenote) return;
+	if (!isMyNote.value) return;
 	os.popupMenu(
 		[
 			{
@@ -643,39 +787,10 @@ function readPromo() {
 	isDeleted.value = true;
 }
 
-const postIsExpanded = ref(false);
-
 function setPostExpanded(val: boolean) {
 	postIsExpanded.value = val;
 }
 
-const accessibleLabel = computed(() => {
-	let label = `${appearNote.value.user.username}; `;
-	if (appearNote.value.renote) {
-		label += `${i18n.ts.renoted} ${appearNote.value.renote.user.username}; `;
-		if (appearNote.value.renote.cw) {
-			label += `${i18n.ts.cw}: ${appearNote.value.renote.cw}; `;
-			if (postIsExpanded.value) {
-				label += `${appearNote.value.renote.text}; `;
-			}
-		} else {
-			label += `${appearNote.value.renote.text}; `;
-		}
-	} else {
-		if (appearNote.value.cw) {
-			label += `${i18n.ts.cw}: ${appearNote.value.cw}; `;
-			if (postIsExpanded.value) {
-				label += `${appearNote.value.text}; `;
-			}
-		} else {
-			label += `${appearNote.value.text}; `;
-		}
-	}
-	const date = new Date(appearNote.value.createdAt);
-	label += `${date.toLocaleTimeString()}`;
-	return label;
-});
-
 defineExpose({
 	focus,
 	blur,
@@ -749,6 +864,7 @@ defineExpose({
 		position: relative;
 		padding: 0 32px 0 32px;
 		display: flex;
+		flex-wrap: wrap;
 		z-index: 1;
 		&:first-child {
 			margin-top: 20px;
@@ -801,6 +917,16 @@ defineExpose({
 				margin-right: 4px;
 			}
 
+			.avatar {
+				width: 1.2em;
+				height: 1.2em;
+				border-radius: 2em;
+				overflow: hidden;
+				margin-right: 0.4em;
+				background: var(--panelHighlight);
+				transform: translateY(-4px);
+			}
+
 			> span {
 				overflow: hidden;
 				flex-shrink: 1;
diff --git a/packages/client/src/components/MkNotes.vue b/packages/client/src/components/MkNotes.vue
index d0ee3bc316..2c79086ae5 100644
--- a/packages/client/src/components/MkNotes.vue
+++ b/packages/client/src/components/MkNotes.vue
@@ -3,6 +3,7 @@
 		ref="pagingComponent"
 		:pagination="pagination"
 		:disable-auto-load="disableAutoLoad"
+		:folder
 	>
 		<template #empty>
 			<div class="_fullinfo">
@@ -15,7 +16,7 @@
 			</div>
 		</template>
 
-		<template #default="{ items: notes }">
+		<template #default="{ foldedItems: notes }">
 			<div ref="tlEl" class="giivymft" :class="{ noGap }">
 				<XList
 					ref="notes"
@@ -28,10 +29,24 @@
 					class="notes"
 				>
 					<XNote
+						v-if="'folded' in note && note.folded === 'thread'"
+						:key="note.id"
+						class="qtqtichx"
+						:note="note.note"
+						:parents="note.parents"
+					/>
+					<XNote
+						v-else-if="'folded' in note && note.folded === 'renote'"
+						:key="note.key"
+						class="qtqtichx"
+						:note="note.note"
+						:renotes="note.renotesArr"
+					/>
+					<XNote
+						v-else
 						:key="note._featuredId_ || note._prId_ || note.id"
 						class="qtqtichx"
 						:note="note"
-						:collapsed-reply="collapsedReply"
 					/>
 				</XList>
 			</div>
@@ -52,15 +67,21 @@ import XList from "@/components/MkDateSeparatedList.vue";
 import MkPagination from "@/components/MkPagination.vue";
 import { i18n } from "@/i18n";
 import { scroll } from "@/scripts/scroll";
+import type { NoteFolded, NoteThread, NoteType } from "@/types/note";
 
 const tlEl = ref<HTMLElement>();
 
-defineProps<{
-	pagination: PagingOf<entities.Note>;
-	noGap?: boolean;
-	disableAutoLoad?: boolean;
-	collapsedReply?: boolean;
-}>();
+withDefaults(
+	defineProps<{
+		pagination: PagingOf<entities.Note>;
+		noGap?: boolean;
+		disableAutoLoad?: boolean;
+		folder?: (ns: entities.Note[]) => (NoteType | NoteThread | NoteFolded)[];
+	}>(),
+	{
+		folder: (ns: entities.Note[]) => ns,
+	},
+);
 
 const pagingComponent = ref<MkPaginationType<
 	PagingKeyOf<entities.Note>
diff --git a/packages/client/src/components/MkNotifications.vue b/packages/client/src/components/MkNotifications.vue
index 54ad83e6d1..08318c6361 100644
--- a/packages/client/src/components/MkNotifications.vue
+++ b/packages/client/src/components/MkNotifications.vue
@@ -81,30 +81,34 @@ const pagingComponent = ref<MkPaginationType<"i/notifications"> | null>(null);
 
 const shouldFold = defaultStore.reactiveState.foldNotification;
 
-const convertNotification = computed(() => shouldFold.value ? foldNotifications : (ns: entities.Notification[]) => ns);
+const convertNotification = computed(() =>
+	shouldFold.value ? foldNotifications : (ns: entities.Notification[]) => ns,
+);
 
 const FETCH_LIMIT = 90;
 
-const pagination = computed(() => Object.assign(
-	{
-		endpoint: "i/notifications" as const,
-		params: computed(() => ({
-			includeTypes: props.includeTypes ?? undefined,
-			excludeTypes: props.includeTypes
-				? undefined
-				: me?.mutingNotificationTypes,
-			unreadOnly: props.unreadOnly,
-		})),
-	},
-	shouldFold.value
-		? {
-				limit: 50,
-				secondFetchLimit: FETCH_LIMIT,
-			}
-		: {
-				limit: 30,
-			},
-));
+const pagination = computed(() =>
+	Object.assign(
+		{
+			endpoint: "i/notifications" as const,
+			params: computed(() => ({
+				includeTypes: props.includeTypes ?? undefined,
+				excludeTypes: props.includeTypes
+					? undefined
+					: me?.mutingNotificationTypes,
+				unreadOnly: props.unreadOnly,
+			})),
+		},
+		shouldFold.value
+			? {
+					limit: 50,
+					secondFetchLimit: FETCH_LIMIT,
+				}
+			: {
+					limit: 30,
+				},
+	),
+);
 
 function isNoteNotification(
 	n: entities.Notification,
diff --git a/packages/client/src/components/MkPagination.vue b/packages/client/src/components/MkPagination.vue
index bf030c2a7f..f426610bc3 100644
--- a/packages/client/src/components/MkPagination.vue
+++ b/packages/client/src/components/MkPagination.vue
@@ -365,9 +365,9 @@ async function fetch(firstFetching?: boolean) {
 						}
 
 						// biome-ignore lint/style/noParameterAssign: assign it intentially
-						res = res.filter((item) => {
-							if (idMap.has(item)) return false;
-							idMap.set(item, true);
+						res = res.filter((it) => {
+							if (idMap.has(it.id)) return false;
+							idMap.set(it.id, true);
 							return true;
 						});
 					}
@@ -435,8 +435,20 @@ const prepend = (...item: Item[]): void => {
 	}
 };
 
-const append = (...items: Item[]): void => {
-	appended.value.push(...items);
+const append = (...it: Item[]): void => {
+	// If there are too many appended, merge them into arrItems
+	if (
+		appended.value.length >
+		(props.pagination.secondFetchLimit || SECOND_FETCH_LIMIT_DEFAULT)
+	) {
+		for (const item of appended.value) {
+			idMap.set(item.id, true);
+		}
+		arrItems.value.push(appended.value);
+		appended.value = [];
+		// We don't need to calculate here because it won't cause any changes in items
+	}
+	appended.value.push(...it);
 	calculateItems();
 };
 
diff --git a/packages/client/src/components/MkTimeline.vue b/packages/client/src/components/MkTimeline.vue
index aed2368fa4..ec70f14f04 100644
--- a/packages/client/src/components/MkTimeline.vue
+++ b/packages/client/src/components/MkTimeline.vue
@@ -30,7 +30,7 @@
 			:pagination="pagination"
 			@queue="(x) => (queue = x)"
 			@status="pullToRefreshComponent?.setDisabled($event)"
-			:collapsed-reply
+			:folder
 		/>
 	</MkPullToRefresh>
 	<XNotes
@@ -40,7 +40,7 @@
 		:pagination="pagination"
 		@queue="(x) => (queue = x)"
 		@status="pullToRefreshComponent?.setDisabled($event)"
-		:collapsed-reply
+		:folder
 	/>
 </template>
 
@@ -56,6 +56,8 @@ import { isSignedIn, me } from "@/me";
 import { i18n } from "@/i18n";
 import { defaultStore } from "@/store";
 import icon from "@/scripts/icon";
+import { foldNotes } from "@/scripts/fold";
+import type { NoteType } from "@/types/note";
 
 export type TimelineSource =
 	| "antenna"
@@ -87,7 +89,11 @@ const emit = defineEmits<{
 const tlComponent = ref<InstanceType<typeof XNotes>>();
 const pullToRefreshComponent = ref<InstanceType<typeof MkPullToRefresh>>();
 
-const collapsedReply = defaultStore.reactiveState.collapseReplyInTimeline;
+const folder = computed(() => {
+	const mergeThread = defaultStore.reactiveState.mergeThreadInTimeline.value;
+	const mergeRenotes = defaultStore.reactiveState.mergeRenotesInTimeline.value;
+	return (ns: NoteType[]) => foldNotes(ns, mergeThread, mergeRenotes);
+});
 
 let endpoint: TypeUtils.EndpointsOf<entities.Note[]>; // keyof Endpoints
 let query: {
diff --git a/packages/client/src/pages/settings/general.vue b/packages/client/src/pages/settings/general.vue
index d661f770fc..05cbe4806a 100644
--- a/packages/client/src/pages/settings/general.vue
+++ b/packages/client/src/pages/settings/general.vue
@@ -134,8 +134,11 @@
 			<FormSwitch v-model="foldNotification" class="_formBlock">{{
 				i18n.ts.foldNotification
 			}}</FormSwitch>
-			<FormSwitch v-model="collapseReplyInTimeline" class="_formBlock">{{
-				i18n.ts.collapseReplyInTimeline
+			<FormSwitch v-model="mergeThreadInTimeline" class="_formBlock">{{
+				i18n.ts.mergeThreadInTimeline
+			}}</FormSwitch>
+			<FormSwitch v-model="mergeRenotesInTimeline" class="_formBlock">{{
+				i18n.ts.mergeRenotesInTimeline
 			}}</FormSwitch>
 
 			<FormSelect v-model="serverDisconnectedBehavior" class="_formBlock">
@@ -552,8 +555,11 @@ const autocorrectNoteLanguage = computed(
 const foldNotification = computed(
 	defaultStore.makeGetterSetter("foldNotification"),
 );
-const collapseReplyInTimeline = computed(
-	defaultStore.makeGetterSetter("collapseReplyInTimeline"),
+const mergeThreadInTimeline = computed(
+	defaultStore.makeGetterSetter("mergeThreadInTimeline"),
+);
+const mergeRenotesInTimeline = computed(
+	defaultStore.makeGetterSetter("mergeRenotesInTimeline"),
 );
 
 // This feature (along with injectPromo) is currently disabled
diff --git a/packages/client/src/scripts/fold.ts b/packages/client/src/scripts/fold.ts
index c1546efa68..1fa93b64b4 100644
--- a/packages/client/src/scripts/fold.ts
+++ b/packages/client/src/scripts/fold.ts
@@ -3,6 +3,9 @@ import type {
 	FoldableNotification,
 	NotificationFolded,
 } from "@/types/notification";
+import type { NoteType, NoteThread, NoteFolded } from "@/types/note";
+import { me } from "@/me";
+import { isDeleted, isRenote } from "./note";
 
 interface FoldOption {
 	/** If items length is 1, skip aggregation */
@@ -91,3 +94,89 @@ export function foldNotifications(ns: entities.Notification[]) {
 		},
 	);
 }
+
+export function foldNotes(ns: NoteType[], foldReply = true, foldRenote = true) {
+	// By the implement of MkPagination, lastId is unique and is safe for key
+	const lastId = ns[ns.length - 1]?.id ?? "prepend";
+
+	function foldReplies(ns: NoteType[]) {
+		const res: Array<NoteType | NoteThread> = [];
+		const threads = new Map<NoteType["id"], NoteType[]>();
+
+		for (const n of [...ns].reverse()) {
+			if (isDeleted(n.id)) {
+				continue;
+			}
+			if (n.replyId && threads.has(n.replyId)) {
+				const th = threads.get(n.replyId)!;
+				threads.delete(n.replyId);
+				th.push(n);
+				threads.set(n.id, th);
+			} else {
+				threads.set(n.id, [n]);
+			}
+		}
+
+		for (const n of ns) {
+			const conversation = threads.get(n.id);
+			if (conversation == null) continue;
+
+			const first = conversation[0];
+			const last = conversation[conversation.length - 1];
+			if (conversation.length === 1) {
+				res.push(first);
+				continue;
+			}
+
+			res.push({
+				// The same note can only appear once in the timeline, so the ID will not be repeated
+				id: first.id,
+				createdAt: last.createdAt,
+				folded: "thread",
+				note: last,
+				parents: (first.reply ? [first.reply] : []).concat(
+					conversation.slice(0, -1),
+				),
+			});
+		}
+
+		return res;
+	}
+
+	let res: (NoteType | NoteThread | NoteFolded)[] = ns;
+
+	if (foldReply) {
+		res = foldReplies(ns);
+	}
+
+	if (foldRenote) {
+		res = foldItems(
+			res,
+			(n) => {
+				// never fold my renotes
+				if (!("folded" in n) && isRenote(n) && n.userId !== me?.id)
+					return `renote-${n.renoteId}`;
+				return n.id;
+			},
+			(ns, key) => {
+				const represent = ns[0];
+				if (!key.startsWith("renote-")) {
+					return represent;
+				}
+				return {
+					id: `G-${lastId}-${key}`,
+					key: `G-${lastId}-${key}`,
+					createdAt: represent.createdAt,
+					folded: "renote",
+					note: (represent as entities.Note).renote!,
+					renotesArr: ns as entities.Note[],
+				};
+			},
+			{
+				skipSingleElement: false,
+			},
+		);
+	}
+
+	return res;
+}
diff --git a/packages/client/src/scripts/note.ts b/packages/client/src/scripts/note.ts
new file mode 100644
index 0000000000..9dba513006
--- /dev/null
+++ b/packages/client/src/scripts/note.ts
@@ -0,0 +1,20 @@
+import type { entities } from "firefish-js";
+import { deletedNoteIds } from "./use-note-capture";
+
+export function isRenote(note: entities.Note): note is entities.Note & {
+	renote: entities.Note;
+	text: null;
+	renoteId: string;
+	poll: undefined;
+} {
+	return (
+		note.renote != null &&
+		note.text == null &&
+		note.fileIds.length === 0 &&
+		note.poll == null
+	);
+}
+
+export function isDeleted(noteId: string) {
+	return deletedNoteIds.has(noteId);
+}
diff --git a/packages/client/src/scripts/use-note-capture.ts b/packages/client/src/scripts/use-note-capture.ts
index 0d0d4dbe5b..443a6749d9 100644
--- a/packages/client/src/scripts/use-note-capture.ts
+++ b/packages/client/src/scripts/use-note-capture.ts
@@ -1,22 +1,62 @@
 import type { Ref } from "vue";
 import { onUnmounted } from "vue";
-import type { entities } from "firefish-js";
 import { useStream } from "@/stream";
 import { isSignedIn, me } from "@/me";
 import * as os from "@/os";
+import type { NoteType } from "@/types/note";
+
+export const deletedNoteIds = new Map<NoteType["id"], boolean>();
+
+const noteRefs = new Map<NoteType["id"], Ref<NoteType>[]>();
+
+function addToNoteRefs(note: Ref<NoteType>) {
+	const refs = noteRefs.get(note.value.id);
+	if (refs) {
+		refs.push(note);
+	} else {
+		noteRefs.set(note.value.id, [note]);
+	}
+}
+
+function eachNote(id: NoteType["id"], cb: (note: Ref<NoteType>) => void) {
+	const refs = noteRefs.get(id);
+	if (refs) {
+		for (const n of refs) {
+			// n.value.id maybe changed
+			if (n.value.id === id) {
+				cb(n);
+			}
+		}
+	}
+}
 
 export function useNoteCapture(props: {
 	rootEl: Ref<HTMLElement | null>;
-	note: Ref<entities.Note>;
+	note: Ref<NoteType>;
 	isDeletedRef: Ref<boolean>;
-	onReplied?: (note: entities.Note) => void;
+	onReplied?: (note: NoteType) => void;
 }) {
+	let closed = false;
 	const note = props.note;
 	const connection = isSignedIn(me) ? useStream() : null;
+	addToNoteRefs(note);
+
+	function onDeleted() {
+		props.isDeletedRef.value = true;
+		deletedNoteIds.set(note.value.id, true);
+
+		if (note.value.replyId) {
+			eachNote(note.value.replyId, (n) => n.value.repliesCount--);
+		}
+		if (note.value.renoteId) {
+			eachNote(note.value.renoteId, (n) => n.value.renoteCount--);
+		}
+	}
 
 	async function onStreamNoteUpdated(noteData): Promise<void> {
 		const { type, id, body } = noteData;
 
+		if (closed) return;
 		if (id !== note.value.id) return;
 
 		switch (type) {
@@ -87,7 +127,7 @@ export function useNoteCapture(props: {
 			}
 
 			case "deleted": {
-				props.isDeletedRef.value = true;
+				onDeleted();
 				break;
 			}
 
@@ -96,17 +136,14 @@ export function useNoteCapture(props: {
 					const editedNote = await os.api("notes/show", {
 						noteId: id,
 					});
-
-					const keys = new Set<string>();
-					Object.keys(editedNote)
-						.concat(Object.keys(note.value))
-						.forEach((key) => keys.add(key));
-					keys.forEach((key) => {
+					for (const key of [
+						...new Set(Object.keys(editedNote).concat(Object.keys(note.value))),
+					]) {
 						note.value[key] = editedNote[key];
-					});
+					}
 				} catch {
 					// delete the note if failing to get the edited note
-					props.isDeletedRef.value = true;
+					onDeleted();
 				}
 				break;
 			}
@@ -147,4 +184,10 @@ export function useNoteCapture(props: {
 			connection.off("_connected_", onStreamConnected);
 		}
 	});
+
+	return {
+		close: () => {
+			closed = true;
+		},
+	};
 }
diff --git a/packages/client/src/store.ts b/packages/client/src/store.ts
index f95a9aa248..a742a13ddc 100644
--- a/packages/client/src/store.ts
+++ b/packages/client/src/store.ts
@@ -454,9 +454,13 @@ export const defaultStore = markRaw(
 			where: "deviceAccount",
 			default: true,
 		},
-		collapseReplyInTimeline: {
+		mergeThreadInTimeline: {
 			where: "deviceAccount",
-			default: false,
+			default: true,
+		},
+		mergeRenotesInTimeline: {
+			where: "deviceAccount",
+			default: true,
 		},
 	}),
 );
diff --git a/packages/client/src/types/note.ts b/packages/client/src/types/note.ts
index 17338c02b8..e7959e5688 100644
--- a/packages/client/src/types/note.ts
+++ b/packages/client/src/types/note.ts
@@ -1,4 +1,4 @@
-import type { noteVisibilities } from "firefish-js";
+import type { entities, noteVisibilities } from "firefish-js";
 
 export type NoteVisibility = (typeof noteVisibilities)[number] | "private";
 
@@ -6,3 +6,25 @@ export interface NoteTranslation {
 	sourceLang: string;
 	text: string;
 }
+
+export type NoteType = entities.Note & {
+	_featuredId_?: string;
+	_prId_?: string;
+};
+
+export type NoteFolded = {
+	id: string;
+	key: string;
+	createdAt: entities.Note["createdAt"];
+	folded: "renote";
+	note: entities.Note;
+	renotesArr: entities.Note[];
+};
+
+export type NoteThread = {
+	id: string;
+	createdAt: entities.Note["createdAt"];
+	folded: "thread";
+	note: entities.Note;
+	parents: entities.Note[];
+};