diff --git a/packages/backend/src/core/entities/DriveFileEntityService.ts b/packages/backend/src/core/entities/DriveFileEntityService.ts
index a6f7f369a6..1865d494c4 100644
--- a/packages/backend/src/core/entities/DriveFileEntityService.ts
+++ b/packages/backend/src/core/entities/DriveFileEntityService.ts
@@ -17,6 +17,7 @@ import { deepClone } from '@/misc/clone.js';
 import { bindThis } from '@/decorators.js';
 import { isMimeImage } from '@/misc/is-mime-image.js';
 import { IdService } from '@/core/IdService.js';
+import { uniqueByKey } from '@/misc/unique-by-key.js';
 import { UtilityService } from '../UtilityService.js';
 import { VideoProcessingService } from '../VideoProcessingService.js';
 import { UserEntityService } from './UserEntityService.js';
@@ -226,6 +227,7 @@ export class DriveFileEntityService {
 		options?: PackOptions,
 		hint?: {
 			packedUser?: Packed<'UserLite'>
+			packedFolder?: Packed<'DriveFolder'>
 		},
 	): Promise<Packed<'DriveFile'> | null> {
 		const opts = Object.assign({
@@ -250,9 +252,9 @@ export class DriveFileEntityService {
 			thumbnailUrl: this.getThumbnailUrl(file),
 			comment: file.comment,
 			folderId: file.folderId,
-			folder: opts.detail && file.folderId ? this.driveFolderEntityService.pack(file.folderId, {
+			folder: opts.detail && file.folderId ? (hint?.packedFolder ?? this.driveFolderEntityService.pack(file.folderId, {
 				detail: true,
-			}) : null,
+			})) : null,
 			userId: file.userId,
 			user: (opts.withUser && file.userId) ? hint?.packedUser ?? this.userEntityService.pack(file.userId) : null,
 		});
@@ -263,10 +265,41 @@ export class DriveFileEntityService {
 		files: MiDriveFile[],
 		options?: PackOptions,
 	): Promise<Packed<'DriveFile'>[]> {
-		const _user = files.map(({ user, userId }) => user ?? userId).filter(x => x != null);
-		const _userMap = await this.userEntityService.packMany(_user)
-			.then(users => new Map(users.map(user => [user.id, user])));
-		const items = await Promise.all(files.map(f => this.packNullable(f, options, f.userId ? { packedUser: _userMap.get(f.userId) } : {})));
+		// -- ユーザ情報の事前取得 --
+
+		let userMap: Map<string, Packed<'UserLite'>> | null = null;
+		if (options?.withUser) {
+			const users = files
+				.map(({ user, userId }) => user ?? userId)
+				.filter(x => x != null);
+
+			const uniqueUsers = uniqueByKey(users, (user) => typeof user === 'string' ? user : user.id);
+			const packedUsers = await this.userEntityService.packMany(uniqueUsers);
+			userMap = new Map(packedUsers.map(user => [user.id, user]));
+		}
+
+		// -- フォルダ情報の事前取得 --
+
+		let folderMap: Map<string, Packed<'DriveFolder'>> | null = null;
+		if (options?.detail) {
+			const folders = files
+				.map(({ folder, folderId }) => folder ?? folderId)
+				.filter(x => x != null);
+
+			const uniqueFolders = uniqueByKey(folders, (folder) => typeof folder === 'string' ? folder : folder.id);
+			const packedFolders = await this.driveFolderEntityService.packMany(uniqueFolders, { detail: true });
+			folderMap = new Map(packedFolders.map(folder => [folder.id, folder]));
+		}
+
+		const items = await Promise.all(files.map(f => this.packNullable(
+			f,
+			options,
+			{
+				packedUser: f.userId ? userMap?.get(f.userId) : undefined,
+				packedFolder: f.folderId ? folderMap?.get(f.folderId) : undefined,
+			},
+		)));
+
 		return items.filter(x => x != null);
 	}
 
diff --git a/packages/backend/src/core/entities/DriveFolderEntityService.ts b/packages/backend/src/core/entities/DriveFolderEntityService.ts
index 299f23ad38..7d911cf3a4 100644
--- a/packages/backend/src/core/entities/DriveFolderEntityService.ts
+++ b/packages/backend/src/core/entities/DriveFolderEntityService.ts
@@ -12,6 +12,9 @@ import type { } from '@/models/Blocking.js';
 import type { MiDriveFolder } from '@/models/DriveFolder.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
+import { In } from 'typeorm';
+import { uniqueByKey } from '@/misc/unique-by-key.js';
+import { splitIdAndObjects } from '@/misc/split-id-and-objects.js';
 
 @Injectable()
 export class DriveFolderEntityService {
@@ -32,12 +35,20 @@ export class DriveFolderEntityService {
 		options?: {
 			detail: boolean
 		},
+		hint?: {
+			folderMap?: Map<string, MiDriveFolder>;
+			foldersCountMap?: Map<string, number> | null;
+			filesCountMap?: Map<string, number> | null;
+			parentPacker?: (id: string) => Promise<Packed<'DriveFolder'>>;
+		},
 	): Promise<Packed<'DriveFolder'>> {
 		const opts = Object.assign({
 			detail: false,
 		}, options);
 
-		const folder = typeof src === 'object' ? src : await this.driveFoldersRepository.findOneByOrFail({ id: src });
+		const folder = typeof src === 'object'
+			? src
+			: hint?.folderMap?.get(src) ?? await this.driveFoldersRepository.findOneByOrFail({ id: src });
 
 		return await awaitAll({
 			id: folder.id,
@@ -46,20 +57,141 @@ export class DriveFolderEntityService {
 			parentId: folder.parentId,
 
 			...(opts.detail ? {
-				foldersCount: this.driveFoldersRepository.countBy({
-					parentId: folder.id,
-				}),
-				filesCount: this.driveFilesRepository.countBy({
-					folderId: folder.id,
-				}),
+				foldersCount: hint?.foldersCountMap?.get(folder.id)
+					?? this.driveFoldersRepository.countBy({
+						parentId: folder.id,
+					}),
+				filesCount: hint?.filesCountMap?.get(folder.id)
+					?? this.driveFilesRepository.countBy({
+						folderId: folder.id,
+					}),
 
 				...(folder.parentId ? {
-					parent: this.pack(folder.parentId, {
-						detail: true,
-					}),
+					parent: hint?.parentPacker
+						? hint.parentPacker(folder.parentId)
+						: this.pack(folder.parentId, { detail: true }, hint),
 				} : {}),
 			} : {}),
 		});
 	}
-}
 
+	public async packMany(
+		src: Array<MiDriveFolder['id'] | MiDriveFolder>,
+		options?: {
+			detail: boolean
+		},
+	): Promise<Array<Packed<'DriveFolder'>>> {
+		/**
+		 * 重複を除去しつつ、必要なDriveFolderオブジェクトをすべて取得する
+		 */
+		const collectUniqueObjects = async (src: Array<MiDriveFolder['id'] | MiDriveFolder>) => {
+			const uniqueSrc = uniqueByKey(
+				src,
+				(s) => typeof s === 'string' ? s : s.id,
+			);
+			const { ids, objects } = splitIdAndObjects(uniqueSrc);
+
+			const uniqueObjects = new Map<string, MiDriveFolder>(objects.map(s => [s.id, s]));
+			const needsFetchIds = ids.filter(id => !uniqueObjects.has(id));
+
+			if (needsFetchIds.length > 0) {
+				const fetchedObjects = await this.driveFoldersRepository.find({
+					where: {
+						id: In(needsFetchIds),
+					},
+				});
+				for (const obj of fetchedObjects) {
+					uniqueObjects.set(obj.id, obj);
+				}
+			}
+
+			return uniqueObjects;
+		};
+
+		/**
+		 * 親フォルダーを再帰的に収集する
+		 */
+		const collectAncestors = async (folderMap: Map<string, MiDriveFolder>) => {
+			for (;;) {
+				const parentIds = new Set<string>();
+				for (const folder of folderMap.values()) {
+					if (folder.parentId != null && !folderMap.has(folder.parentId)) {
+						parentIds.add(folder.parentId);
+					}
+				}
+
+				if (parentIds.size === 0) break;
+
+				const fetchedParents = await this.driveFoldersRepository.find({
+					where: {
+						id: In([...parentIds]),
+					},
+				});
+
+				if (fetchedParents.length === 0) break;
+
+				for (const parent of fetchedParents) {
+					folderMap.set(parent.id, parent);
+				}
+			}
+		};
+
+		const opts = Object.assign({
+			detail: false,
+		}, options);
+
+		const folderMap = await collectUniqueObjects(src);
+
+		let foldersCountMap: Map<string, number> | null = null;
+		let filesCountMap: Map<string, number> | null = null;
+		if (opts.detail) {
+			await collectAncestors(folderMap);
+
+			const ids = [...folderMap.keys()];
+			if (ids.length > 0) {
+				const folderCounts = await this.driveFoldersRepository.createQueryBuilder('folder')
+					.select('folder.parentId', 'parentId')
+					.addSelect('COUNT(*)', 'count')
+					.where('folder.parentId IN (:...ids)', { ids })
+					.groupBy('folder.parentId')
+					.getRawMany<{ parentId: string; count: number }>();
+
+				const fileCounts = await this.driveFilesRepository.createQueryBuilder('file')
+					.select('file.folderId', 'folderId')
+					.addSelect('COUNT(*)', 'count')
+					.where('file.folderId IN (:...ids)', { ids })
+					.groupBy('file.folderId')
+					.getRawMany<{ folderId: string; count: number }>();
+
+				foldersCountMap = new Map(folderCounts.map(row => [row.parentId, row.count]));
+				filesCountMap = new Map(fileCounts.map(row => [row.folderId, row.count]));
+			} else {
+				foldersCountMap = new Map();
+				filesCountMap = new Map();
+			}
+		}
+
+		const packedMap = new Map<string, Promise<Packed<'DriveFolder'>>>();
+		const packFromId = (id: string): Promise<Packed<'DriveFolder'>> => {
+			const cached = packedMap.get(id);
+			if (cached) return cached;
+
+			const folder = folderMap.get(id);
+			if (!folder) {
+				throw new Error(`DriveFolder not found: ${id}`);
+			}
+
+			const packedPromise = this.pack(folder, options, {
+				folderMap,
+				foldersCountMap,
+				filesCountMap,
+				parentPacker: packFromId,
+			});
+			packedMap.set(id, packedPromise);
+
+			return packedPromise;
+		};
+
+		return Promise.all(src.map(s => packFromId(typeof s === 'string' ? s : s.id)));
+	}
+}
diff --git a/packages/backend/src/misc/split-id-and-objects.ts b/packages/backend/src/misc/split-id-and-objects.ts
new file mode 100644
index 0000000000..d23bb93695
--- /dev/null
+++ b/packages/backend/src/misc/split-id-and-objects.ts
@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * idとオブジェクトを分離する
+ * @param input idまたはオブジェクトの配列
+ * @returns idの配列とオブジェクトの配列
+ */
+export function splitIdAndObjects<T extends { id: string }>(input: (T | string)[]): { ids: string[]; objects: T[] } {
+	const ids: string[] = [];
+	const objects : T[] = [];
+
+	for (const item of input) {
+		if (typeof item === 'string') {
+			ids.push(item);
+		} else {
+			objects.push(item);
+		}
+	}
+
+	return {
+		ids,
+		objects,
+	};
+}
diff --git a/packages/backend/src/misc/unique-by-key.ts b/packages/backend/src/misc/unique-by-key.ts
new file mode 100644
index 0000000000..4308e29d21
--- /dev/null
+++ b/packages/backend/src/misc/unique-by-key.ts
@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * itemsの中でkey関数が返す値が重複しないようにした配列を返す
+ * @param items 重複を除去したい配列
+ * @param key 重複判定に使うキーを返す関数
+ * @returns 重複を除去した配列
+ */
+export function uniqueByKey<TItem, TKey = string>(items: Iterable<TItem>, key: (item: TItem) => TKey): TItem[] {
+	const map = new Map<TKey, TItem>();
+	for (const item of items) {
+		const k = key(item);
+		if (!map.has(k)) {
+			map.set(k, item);
+		}
+	}
+	return [...map.values()];
+}