Mongoose 6.3.6 Performance slowdown

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the performance issue has not already been reported

Last performant version

6.3.5

Slowed down in version

6.3.6

Node.js version

16.14.2

🦥 Performance issue

Hello!

The latest version of mongoose which is 6.3.6 has significantly increased my bot’s start up time and increased memory usage, as you can see in this picture: (this picture shows how long it took to import a command.)

Meanwhile with 6.3.5, the results differ alot:

As you can see it slows down the bot significantly by around 1000~ ms!

Also here is how I connect to my MongoDB database:

import mongoose from "mongoose";
import { config } from "../../utils/config";

export async function database(): Promise<void> {
    mongoose.connect
        (
            config.MONGODB_URI
        )
        .then(() => console.log(`[DATABASE] Connected to database.`))
        .catch(err => console.log(`[DATABASE] Oops, there was an error! ${err}`));
}

Steps to Reproduce

Run a discord bot with mongoose installed as a npm package and make it connect to a MongoDB database.

Expected Behavior

Should not slow down the bot in any way.

[nikosszzz]

Hmmm, yes. It seems to have improved and is back to normal.

[AbdelrahmanHafez]

I didn’t notice the ts-node bit.

However, running the script in https://github.com/Automattic/mongoose/issues/11919#issuecomment-1152341631 calculates the time of the connection, which still demonstrates the issue, so this eliminates the possibility that this is a TS issue.

However, the issue is solved now, so I think we’re good.