Am I getting serverless function timeouts (error 504) on vercel because I set up next-auth wrong?

Background

I’ve been working on a next.js project that is meant to handle scheduling events. I’ve been using next-auth for authentication with mongodb, because I need a database to store information about scheduled events anyway.

While testing locally, I didn’t have any issues at all, but ever since deploying on vercel AND mongo Atlas, I’ve been getting 504 “serverless function timeouts” up the wazoo on page load. A lot of people have mentioned that this is likely due to not making a connection with the db, but I’m not sure how to fix this. The only function that I am calling inside of getServerSideProps is getSession() as it is called in the docs.

Steps I’ve tried

• I’ve followed the next-auth configuration steps located here for mongodb
• I’ve followed the mongodb guide for vercel best practices here
• I’ve tried connecting to the atlas from the mongosh shell, and it’s always quick as can be.

Conclusion

I’ve seen some stuff around mentioning that other people have been getting some pretty wicked cold start times on their serverless function, so I’ve created a snippet that pings the home page of my app 10 times every 2 minutes. This works okay as far as I can personally test, but 4-5 of any 10 requests hang for 10+ seconds while the rest finish up in roughly 200ms or so.

What am I doing wrong? / What can I do better?

My code

home page:

export const Home = function (props) { ... } // this never gets ran

export async function getServerSideProps(context) {
  const session = await getSession(context);
  const props = { session };
  const redirect = {
    destination: '/login',
    permanent: false,
  };

  return (!session)
    ? { redirect }
    : { props };
}

export default Home;

The login page:

export async function getServerSideProps(context) {
  const session = await getSession(context);

  if (session) {
    return {
      redirect: {
        destination: '/home',
      },
    };
  }

  return {
    props: {
      providers: await getProviders(),
      session,
    },
  };
}

nextAuth config:

import NextAuth from 'next-auth';
import GoogleProvider from 'next-auth/providers/google';
import { MongoDBAdapter } from '@next-auth/mongodb-adapter';
import clientPromise from 'lib/database/mongodb';

export default NextAuth({
  adapter: MongoDBAdapter(clientPromise),
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_ID,
      clientSecret: process.env.GOOGLE_SECRET,
    }),
  ],
  secret: "pshhhh, it's a secret" 
});