diff --git a/package-lock.json b/package-lock.json
index 7f96d4b..14abb32 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10626,6 +10626,11 @@
         "which": "^2.0.1"
       }
     },
+    "crypto": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/crypto/-/crypto-1.0.1.tgz",
+      "integrity": "sha512-VxBKmeNcqQdiUQUW2Tzq0t377b54N2bMtXO/qiLa+6eRRmmC4qT3D4OnTGoT/U6O9aklQ/jTwbOtRMTTY8G0Ig=="
+    },
     "crypto-browserify": {
       "version": "3.12.0",
       "resolved": "https://registry.npmjs.org/crypto-browserify/-/crypto-browserify-3.12.0.tgz",
diff --git a/package.json b/package.json
index a7a4b4f..d48f14c 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "@material-ui/icons": "^4.9.1",
     "@reach/router": "^1.3.4",
     "@types/react-router-dom": "^5.1.6",
+    "crypto": "^1.0.1",
     "graphql": "^15.3.0",
     "react": "^16.14.0",
     "react-dom": "^16.14.0",
diff --git a/server/src/background-process.ts b/server/src/background-process.ts
index 6a88148..90e7612 100644
--- a/server/src/background-process.ts
+++ b/server/src/background-process.ts
@@ -1,3 +1,4 @@
+import { createHash } from 'crypto'
 import { getRepository } from 'typeorm'
 import { Party } from './entities/Party'
 
@@ -9,3 +10,9 @@ export async function deleteOldParties() {
     .where('TIMESTAMPDIFF(HOUR, latestTime, CURRENT_TIMESTAMP()) > 24')
     .execute()
 }
+
+// An expensive hash function to see how it affects performance. Copied from class slides.
+export function expensiveFunction() {
+  const data = 'hash-me'
+  createHash('sha256').update(data).digest('base64')
+}
diff --git a/server/src/config.ts b/server/src/config.ts
index 27c9f0c..8f17d1f 100644
--- a/server/src/config.ts
+++ b/server/src/config.ts
@@ -25,5 +25,5 @@ export const Config = {
   backgroundService: isServiceEnabled(AppService.BACKGROUND) ? true : !isProd(),
   wsUrl: process.env.WS_URL || 'ws://localhost:3000/graphqlsubscription',
   adminPassword: process.env.ADMIN_PASSWORD || 'password',
-  backgroundProcessInterval: 86400000, // In milliseconds.
+  backgroundProcessInterval: 100, // In milliseconds.
 }
diff --git a/server/src/server.ts b/server/src/server.ts
index 5b4d2b4..b18caaa 100644
--- a/server/src/server.ts
+++ b/server/src/server.ts
@@ -16,7 +16,7 @@ import { forAwaitEach, isAsyncIterable } from 'iterall'
 import path from 'path'
 import 'reflect-metadata'
 import { checkEqual, Unpromise } from '../../common/src/util'
-import { deleteOldParties } from './background-process'
+import { expensiveFunction } from './background-process'
 import { Config } from './config'
 import { migrate } from './db/migrate'
 import { initORM } from './db/sql'
@@ -189,7 +189,6 @@ initORM()
   .catch(err => console.error(err))
 
 setInterval(() => {
-  deleteOldParties()
-    .then(() => console.log('Background process run succesfully.'))
-    .catch(err => console.error(err))
+  expensiveFunction()
+  console.log('Background process run succesfully.')
 }, Config.backgroundProcessInterval)