Redis operations are very slow on GCP environment - redis

Question

This is my code example running on local machine with ts-node
import * as redis from 'redis';
const redisClient = redis.createClient({
socket: {
port: 6379,
host: 'localhost',
},
});
redisClient.connect();
function generateRandomString(length: number) {
// generate random string...
}
const run = async () => {
let keys: string[] = [];
const count = 2000;
for(let i = 0; i < count; i++) {
keys.push(generateRandomString(20));
}
console.time('t1');
for(let i = 0; i < count; i++) {
await redisClient.sAdd(keys[i], 'asd');
}
console.timeEnd('t1');
await redisClient.flushAll();
process.exit();
}
run();
Running with ts-node. This operations took ~100ms - very nice.
After this, I prepared simple CloudFunction. The same code with fixes for CF.
Cloud Function with 256MB, and I set vpc connector to the redis
const redis = require('redis');
const redisClient = redis.createClient({
socket: {
port: 6379,
host: '...ip...',
},
});
redisClient.connect();
function generateRandomString(length) {
// generate random string...
}
exports.helloWorld = async (req, res) => {
let keys = [];
const count = 2000;
for(let i = 0; i < count; i++) {
keys.push(generateRandomString(20));
}
console.time('t1');
for(let i = 0; i < count; i++) {
await redisClient.sAdd(keys[i], 'asd');
}
console.timeEnd('t1');
await redisClient.flushAll();
res.status(200).send('done');
};
In the CloudFunction context t1 = 5s. Which is 50x slower. Is this normal? Maybe I'm doing something wrong? Maybe ClodFunction is not suitable for operations like this?
Thanks!
PS. I test the cloudFunction via Testing -> Test the function in gcp console. Maybe it matters