diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index cd6cffb1f..c33c8e84c 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.5.15",
+    "version": "2.5.16",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",
diff --git a/packages/hydrojudge/setting.yaml b/packages/hydrojudge/setting.yaml
index 348ee63b5..6fede66ee 100644
--- a/packages/hydrojudge/setting.yaml
+++ b/packages/hydrojudge/setting.yaml
@@ -98,6 +98,7 @@ langs:
         code_file: Main.java
         target: Main.class
         execute: /usr/bin/java Main
+        time_limit_rate: 2
     py:
         type: compiler
         compile: /usr/bin/python -c "import py_compile; py_compile.compile('${dir}/foo.py', '${dir}/${name}', doraise=True)"
diff --git a/packages/hydrojudge/src/judge/default.ts b/packages/hydrojudge/src/judge/default.ts
index 959f0a2a3..f6f638aff 100644
--- a/packages/hydrojudge/src/judge/default.ts
+++ b/packages/hydrojudge/src/judge/default.ts
@@ -1,5 +1,6 @@
 import Queue from 'p-queue';
 import path from 'path';
+import yaml from 'js-yaml';
 import fs from 'fs-extra';
 import { argv } from 'yargs';
 import * as STATUS from '../status';
@@ -102,6 +103,7 @@ function judgeCase(c, sid) {
 
 function judgeSubtask(subtask, sid) {
     return async (ctx) => {
+        subtask.time *= ctx.time_limit_rate;
         subtask.type = subtask.type || 'min';
         const ctxSubtask = {
             subtask,
@@ -132,6 +134,10 @@ export const judge = async (ctx) => {
             ctx.code = tpl[0] + ctx.code + tpl[1];
         } else throw new CompileError('Language not supported by provided templates');
     }
+    const LANGS = yaml.load(getConfig('langs'));
+    if (!LANGS[ctx.lang]) throw new SystemError('Unsupported language {0}.', [ctx.lang]);
+    const info = LANGS[ctx.lang];
+    ctx.time_limit_rate = info.time_limit_rate || 1;
     ctx.next({ status: STATUS.STATUS_COMPILING });
     [ctx.execute, ctx.checker] = await Promise.all([
         (async () => {
diff --git a/packages/hydrojudge/src/judge/interactive.ts b/packages/hydrojudge/src/judge/interactive.ts
index 6720c1751..1794c89b1 100644
--- a/packages/hydrojudge/src/judge/interactive.ts
+++ b/packages/hydrojudge/src/judge/interactive.ts
@@ -1,6 +1,7 @@
 import Queue from 'p-queue';
 import fs from 'fs-extra';
 import { argv } from 'yargs';
+import yaml from 'js-yaml';
 import * as STATUS from '../status';
 import { parse } from '../testlib';
 import { findFileSync, parseFilename } from '../utils';
@@ -8,6 +9,7 @@ import { run } from '../sandbox';
 import compile from '../compile';
 import signals from '../signals';
 import { getConfig } from '../config';
+import { SystemError } from '../error';
 
 const testlibSrc = findFileSync('@hydrooj/hydrojudge/vendor/testlib/testlib.h');
 const Score = {
@@ -70,6 +72,7 @@ function judgeCase(c) {
 
 function judgeSubtask(subtask) {
     return async (ctx) => {
+        subtask.time *= ctx.time_limit_rate;
         subtask.type = subtask.type || 'min';
         const ctxSubtask = {
             subtask,
@@ -90,6 +93,10 @@ function judgeSubtask(subtask) {
 
 export const judge = async (ctx) => {
     ctx.next({ status: STATUS.STATUS_COMPILING });
+    const LANGS = yaml.load(getConfig('langs'));
+    if (!LANGS[ctx.lang]) throw new SystemError('Unsupported language {0}.', [ctx.lang]);
+    const info = LANGS[ctx.lang];
+    ctx.time_limit_rate = info.time_limit_rate || 1;
     [ctx.executeUser, ctx.executeInteractor] = await Promise.all([
         (async () => {
             const copyIn = {};