createClient in v5 is much slower than in v4

[timonegk]

Description

I im using this redis client in an AWS Lambda to write data to an ElastiCache instance. When updating to v5, I noticed a sharp increase in lambda execution time (previous avg 70ms, new avg 850ms).

The function only connects to the server, does a single RPUSH, and closes the connection.

After downgrading to v4.7.1, the execution time is back down to normal.

Node.js Version

NodeJS 20

Redis Server Version

7.1.0

Node Redis Version

5.0.0

Platform

AWS Lambda

Logs

[htemelski]

Hello @timonegk,
Thank you for flagging this issue.
You are using createClient to initialize the connection, right?

[timonegk]

Yes, I am. I just produced a minimal example:

const redis = require("redis");

for (let i = 0; i < 200; i++) {
  const client = redis.createClient({
    url: "redis://localhost:6379",
  });
}

This takes 3.5s with v5 and 0.26s with v4.