diff --git a/packages/backend/.mocharc.json b/packages/backend/.mocharc.json
deleted file mode 100644
index cfc511621..000000000
--- a/packages/backend/.mocharc.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-	"node-option": [
-		"experimental-specifier-resolution=node"
-	],
-	"slow": 1000,
-	"timeout": 30000,
-	"exit": true
-}
diff --git a/packages/backend/package.json b/packages/backend/package.json
index 53b477163..f16a2e038 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -62,7 +62,6 @@
 		"koa-logger": "3.2.1",
 		"koa-mount": "4.0.0",
 		"koa-send": "5.0.1",
-		"koa-slow": "2.1.0",
 		"koa-views": "7.0.2",
 		"mfm-js": "0.23.3",
 		"mime-types": "2.1.35",
diff --git a/packages/backend/src/@types/koa-slow.d.ts b/packages/backend/src/@types/koa-slow.d.ts
deleted file mode 100644
index e748e2cc9..000000000
--- a/packages/backend/src/@types/koa-slow.d.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-declare module 'koa-slow' {
-	import { Middleware } from 'koa';
-
-	interface ISlowOptions {
-		url?: RegExp;
-		delay?: number;
-	}
-
-	function slow(options?: ISlowOptions): Middleware;
-
-	namespace slow {} // Hack
-
-	export = slow;
-}
diff --git a/packages/backend/src/env.ts b/packages/backend/src/env.ts
index b60f89330..80b33dd19 100644
--- a/packages/backend/src/env.ts
+++ b/packages/backend/src/env.ts
@@ -13,7 +13,6 @@ export const envOption = {
 	noDaemons: false,
 	disableClustering: false,
 	withLogTime: false,
-	slow: false,
 	logLevel: LOG_LEVELS.info,
 };
 
diff --git a/packages/backend/src/server/index.ts b/packages/backend/src/server/index.ts
index 7f8c79d07..3b5fd2bdd 100644
--- a/packages/backend/src/server/index.ts
+++ b/packages/backend/src/server/index.ts
@@ -9,7 +9,6 @@ import Koa from 'koa';
 import Router from '@koa/router';
 import mount from 'koa-mount';
 import koaLogger from 'koa-logger';
-import * as slow from 'koa-slow';
 
 import { IsNull } from 'typeorm';
 import config from '@/config/index.js';
@@ -40,13 +39,6 @@ if (!['production', 'test'].includes(process.env.NODE_ENV || '')) {
 	app.use(koaLogger(str => {
 		serverLogger.info(str);
 	}));
-
-	// Delay
-	if (envOption.slow) {
-		app.use(slow({
-			delay: 3000,
-		}));
-	}
 }
 
 // HSTS