diff --git a/packages/backend/src/db/scylla.ts b/packages/backend/src/db/scylla.ts
index a658e54035..08c08a0430 100644
--- a/packages/backend/src/db/scylla.ts
+++ b/packages/backend/src/db/scylla.ts
@@ -9,6 +9,7 @@ import {
 	ChannelFollowingsCache,
 	InstanceMutingsCache,
 	LocalFollowingsCache,
+	RenoteMutingsCache,
 	UserBlockedCache,
 	UserMutingsCache,
 	userWordMuteCache,
@@ -16,7 +17,7 @@ import {
 import { getTimestamp } from "@/misc/gen-id.js";
 import Logger from "@/services/logger.js";
 import { UserProfiles } from "@/models/index.js";
-import { getWordHardMute } from "@/misc/check-word-mute";
+import { getWordHardMute } from "@/misc/check-word-mute.js";
 
 function newClient(): Client | null {
 	if (!config.scylla) {
@@ -107,8 +108,8 @@ export const prepared = {
 			(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
 		select: {
 			byDate: `SELECT * FROM note WHERE "createdAtDate" = ?`,
-			byUri: `SELECT * FROM note WHERE "uri" IN ?`,
-			byUrl: `SELECT * FROM note WHERE "url" IN ?`,
+			byUri: `SELECT * FROM note WHERE "uri" = ?`,
+			byUrl: `SELECT * FROM note WHERE "url" = ?`,
 			byId: `SELECT * FROM note_by_id WHERE "id" IN ?`,
 			byUserId: `SELECT * FROM note_by_userid WHERE "userId" IN ?`,
 		},
@@ -482,3 +483,15 @@ export async function filterBlockedUser(
 			!(note.renoteUserId && blockerIds.includes(note.renoteUserId)),
 	);
 }
+
+export async function filterMutedRenotes(
+	notes: ScyllaNote[],
+	user: { id: User["id"] },
+): Promise<ScyllaNote[]> {
+	const cache = await RenoteMutingsCache.init(user.id);
+	const muteeIds = await cache.getAll();
+
+	return notes.filter(
+		(note) => note.text || !note.renoteId || !muteeIds.includes(note.userId),
+	);
+}
diff --git a/packages/backend/src/misc/cache.ts b/packages/backend/src/misc/cache.ts
index b8cf15d8d3..b97cc13b3e 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -7,6 +7,7 @@ import {
 	Followings,
 	MutedNotes,
 	Mutings,
+	RenoteMutings,
 	UserProfiles,
 } from "@/models/index.js";
 import { IsNull } from "typeorm";
@@ -73,7 +74,7 @@ export class Cache<T> {
 
 	public async delete(...keys: (string | null)[]): Promise<void> {
 		if (keys.length > 0) {
-			const _keys = keys.map(this.prefixedKey);
+			const _keys = keys.map((key) => this.prefixedKey(key));
 			await redisClient.del(_keys);
 		}
 	}
@@ -233,7 +234,9 @@ class HashCache {
 	}
 
 	public async delete(...fields: string[]) {
-		await redisClient.hdel(this.key, ...fields);
+		if (fields.length > 0) {
+			await redisClient.hdel(this.key, ...fields);
+		}
 	}
 
 	public async clear() {
@@ -401,3 +404,22 @@ export class UserBlockedCache extends SetCache {
 }
 
 export const userWordMuteCache = new Cache<string[][]>("mutedWord", 60 * 30);
+
+export class RenoteMutingsCache extends SetCache {
+	private constructor(userId: string) {
+		const fetcher = () =>
+			RenoteMutings.find({
+				select: ["muteeId"],
+				where: { muterId: userId },
+			}).then((mutes) => mutes.map(({ muteeId }) => muteeId));
+
+		super("renoteMute", userId, fetcher);
+	}
+
+	public static async init(userId: string): Promise<RenoteMutingsCache> {
+		const cache = new RenoteMutingsCache(userId);
+		await cache.fetch();
+
+		return cache;
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/notes/timeline.ts b/packages/backend/src/server/api/endpoints/notes/timeline.ts
index ecdcaa3e5c..581dc4aa21 100644
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@@ -21,6 +21,7 @@ import {
 	filterMutedUser,
 	filterMutedNote,
 	filterBlockedUser,
+	filterMutedRenotes,
 } from "@/db/scylla.js";
 import { ChannelFollowingsCache, LocalFollowingsCache } from "@/misc/cache.js";
 
@@ -92,6 +93,7 @@ export default define(meta, paramDef, async (ps, user) => {
 			filtered = await filterMutedUser(filtered, user);
 			filtered = await filterMutedNote(filtered, user);
 			filtered = await filterBlockedUser(filtered, user);
+			filtered = await filterMutedRenotes(filtered, user);
 			return filtered;
 		};
 
diff --git a/packages/backend/src/server/api/endpoints/renote-mute/create.ts b/packages/backend/src/server/api/endpoints/renote-mute/create.ts
index f09f197c01..d9a1c365e4 100644
--- a/packages/backend/src/server/api/endpoints/renote-mute/create.ts
+++ b/packages/backend/src/server/api/endpoints/renote-mute/create.ts
@@ -4,6 +4,7 @@ import { RenoteMuting } from "@/models/entities/renote-muting.js";
 import define from "../../define.js";
 import { ApiError } from "../../error.js";
 import { getUser } from "../../common/getters.js";
+import { RenoteMutingsCache } from "@/misc/cache.js";
 
 export const meta = {
 	tags: ["account"],
@@ -47,12 +48,8 @@ export default define(meta, paramDef, async (ps, user) => {
 	});
 
 	// Check if already muting
-	const exist = await RenoteMutings.exist({
-		where: {
-			muterId: muter.id,
-			muteeId: mutee.id,
-		},
-	});
+	const cache = await RenoteMutingsCache.init(muter.id);
+	const exist = await cache.has(mutee.id);
 
 	if (exist) {
 		throw new ApiError(meta.errors.alreadyMuting);
@@ -66,5 +63,7 @@ export default define(meta, paramDef, async (ps, user) => {
 		muteeId: mutee.id,
 	} as RenoteMuting);
 
+	await cache.add(mutee.id);
+
 	// publishUserEvent(user.id, "mute", mutee);
 });
diff --git a/packages/backend/src/server/api/endpoints/renote-mute/delete.ts b/packages/backend/src/server/api/endpoints/renote-mute/delete.ts
index 7a898141c3..5921c47102 100644
--- a/packages/backend/src/server/api/endpoints/renote-mute/delete.ts
+++ b/packages/backend/src/server/api/endpoints/renote-mute/delete.ts
@@ -2,6 +2,7 @@ import { RenoteMutings } from "@/models/index.js";
 import define from "../../define.js";
 import { ApiError } from "../../error.js";
 import { getUser } from "../../common/getters.js";
+import { RenoteMutingsCache } from "@/misc/cache.js";
 
 export const meta = {
 	tags: ["account"],
@@ -45,19 +46,19 @@ export default define(meta, paramDef, async (ps, user) => {
 	});
 
 	// Check not muting
-	const muting = await RenoteMutings.findOneBy({
-		muterId: muter.id,
-		muteeId: mutee.id,
-	});
+	const cache = await RenoteMutingsCache.init(muter.id);
+	const muting = await cache.has(mutee.id);
 
-	if (muting == null) {
+	if (!muting) {
 		throw new ApiError(meta.errors.notMuting);
 	}
 
 	// Delete mute
 	await RenoteMutings.delete({
-		id: muting.id,
+		muterId: muter.id,
+		muteeId: mutee.id,
 	});
+	await cache.delete(mutee.id);
 
 	// publishUserEvent(user.id, "unmute", mutee);
 });
diff --git a/packages/backend/src/services/note/create.ts b/packages/backend/src/services/note/create.ts
index c48544a444..ba433e9450 100644
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@@ -711,7 +711,7 @@ async function insertNote(
 	emojis: string[],
 	mentionedUsers: MinimumUser[],
 ) {
-	if (data.createdAt === null || data.createdAt === undefined) {
+	if (!data.createdAt || isNaN(data.createdAt.getTime())) {
 		data.createdAt = new Date();
 	}
 	const insert = new Note({