diff --git a/.gitignore b/.gitignore
index 1a8ddc59..f90e2cb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ dist/
 .coverage
 globalConfig.json
 *.out
+.clinic/
 
 # Config Files
 /config.yaml
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 4937b9c2..a9f1a522 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -25,7 +25,6 @@
         "koa-router": "^10.0.0",
         "koa-static-cache": "^5.1.3",
         "lodash": "^4.17.21",
-        "lru-cache": "^6.0.0",
         "minio": "7.0.17",
         "moment-timezone": "^0.5.32",
         "mongodb": "^3.6.5",
@@ -36,7 +35,6 @@
         "sockjs": "^0.3.20",
         "superagent": "^6.1.0",
         "systeminformation": "5.6.8",
-        "wtfnode": "^0.8.4",
         "yargs": "^16.2.0"
     },
     "devDependencies": {
@@ -48,14 +46,12 @@
         "@types/koa-router": "^7.4.1",
         "@types/koa-static-cache": "^5.1.0",
         "@types/lodash": "^4.14.168",
-        "@types/lru-cache": "^5.1.0",
         "@types/minio": "^7.0.7",
         "@types/mongodb": "^3.6.10",
         "@types/nodemailer": "^6.4.1",
         "@types/serialize-javascript": "^5.0.0",
         "@types/sockjs": "^0.3.32",
         "@types/superagent": "^4.1.8",
-        "@types/wtfnode": "^0.7.0",
         "@types/yargs": "^16.0.0",
         "formidable": "^1.2.2"
     },
diff --git a/packages/hydrooj/src/loader.ts b/packages/hydrooj/src/loader.ts
index 4499fe5f..bfecff0e 100644
--- a/packages/hydrooj/src/loader.ts
+++ b/packages/hydrooj/src/loader.ts
@@ -41,7 +41,6 @@ import path from 'path';
 import cluster from 'cluster';
 import fs from 'fs-extra';
 import { argv } from 'yargs';
-import wtfnode from 'wtfnode';
 import './utils';
 import { Logger } from './logger';
 import './ui';
@@ -50,14 +49,6 @@ import * as bus from './service/bus';
 export * from './interface';
 const logger = new Logger('loader');
 logger.debug('%o', argv);
-bus.on('app/exit', () => {
-    if (argv.debug) {
-        wtfnode.setLogger('info', logger.info.bind(logger));
-        wtfnode.setLogger('warn', logger.warn.bind(logger));
-        wtfnode.setLogger('error', logger.error.bind(logger));
-        wtfnode.dump();
-    }
-});
 
 async function fork(args: string[] = []) {
     const _args = process.argv.slice(2);
@@ -100,8 +91,12 @@ async function stopWorker() {
 }
 
 async function startWorker(cnt: number, createFirst = true) {
-    await fork(createFirst ? ['--firstWorker'] : undefined);
-    for (let i = 1; i < cnt; i++) await fork();
+    if (argv.single) {
+        await entry({ entry: 'worker' });
+    } else {
+        await fork(createFirst ? ['--firstWorker'] : undefined);
+        for (let i = 1; i < cnt; i++) await fork();
+    }
 }
 
 async function reload(count = 1) {
diff --git a/packages/hydrooj/src/model/oauth.ts b/packages/hydrooj/src/model/oauth.ts
index 3d8db6ba..216f13fe 100644
--- a/packages/hydrooj/src/model/oauth.ts
+++ b/packages/hydrooj/src/model/oauth.ts
@@ -1,4 +1,3 @@
-import Lru from 'lru-cache';
 import { Collection } from 'mongodb';
 import db from '../service/db';
 
@@ -8,21 +7,15 @@ interface OauthMap {
 }
 
 const coll: Collection<OauthMap> = db.collection('oauth');
-const cache = new Lru({
-    maxAge: 5000,
-});
 
 class OauthModel {
     static async get(_id: string) {
-        const res = cache.get(_id);
-        if (res !== undefined) return res;
         const doc = await coll.findOne({ _id });
         if (doc) return doc.uid;
         return null;
     }
 
     static async set(_id: string, value: number) {
-        cache.set(_id, value);
         const res = await coll.findOneAndUpdate(
             { _id },
             { $set: { value } },
diff --git a/packages/hydrooj/src/service/server.ts b/packages/hydrooj/src/service/server.ts
index c29ed602..f1469971 100644
--- a/packages/hydrooj/src/service/server.ts
+++ b/packages/hydrooj/src/service/server.ts
@@ -18,8 +18,9 @@ import sockjs from 'sockjs';
 import type { SetOption } from 'cookies';
 import serialize, { SerializeJSOptions } from 'serialize-javascript';
 import { argv } from 'yargs';
+import { createHash } from 'crypto';
 import * as bus from './bus';
-import { errorMessage, lrucache } from '../utils';
+import { errorMessage } from '../utils';
 import { User, DomainDoc } from '../interface';
 import { Logger } from '../logger';
 import {
@@ -422,10 +423,9 @@ export class Handler extends HandlerCommon {
         if (xff) this.request.ip = this.request.headers[xff.toLowerCase()] || this.request.ip;
     }
 
-    @lrucache
     // eslint-disable-next-line class-methods-use-this
     getCsrfToken(id: string) {
-        return hash('csrf_token', id);
+        return createHash('md5').update(`csrf_token${id}`).digest('hex');
     }
 
     async render(name: string, context: any) {
@@ -457,10 +457,10 @@ export class Handler extends HandlerCommon {
     }
 
     async init({ domainId }) {
+        if (!argv.benchmark) await this.limitRate('global', 10, 50);
         const [absoluteDomain, inferDomain] = await Promise.all([
             domain.get(domainId),
             domain.getByHost(this.request.host),
-            this.limitRate('global', 10, 50),
             this.getSession(),
             this.getBdoc(),
         ]);
diff --git a/packages/hydrooj/src/utils.ts b/packages/hydrooj/src/utils.ts
index 82bd8e20..985cbed5 100644
--- a/packages/hydrooj/src/utils.ts
+++ b/packages/hydrooj/src/utils.ts
@@ -2,8 +2,6 @@ import fs from 'fs';
 import { Duplex } from 'stream';
 import cluster from 'cluster';
 import path, { sep } from 'path';
-import serialize from 'serialize-javascript';
-import Lru from 'lru-cache';
 import { ObjectID } from 'mongodb';
 import { isMoment } from 'moment';
 import type { Moment } from 'moment-timezone';
@@ -29,21 +27,6 @@ declare global {
     }
 }
 
-const lru = new Lru(1000);
-
-export function lrucache(target: any, funcName: string, obj: any) {
-    const originalMethod = obj.value;
-    obj.value = function func(...args: any[]) {
-        const key = serialize({ funcName, args });
-        let val = lru.get(key);
-        if (val) return val;
-        val = originalMethod.call(this, ...args);
-        lru.set(key, val);
-        return val;
-    };
-    return obj;
-}
-
 if (!cluster.worker) {
     // @ts-ignore
     cluster.worker = { id: 0 };