Nodejs Socket.io v4 disconnection problem on 1000 connections with 100 subscription each

I am trying to create one application using nodejs socket.io with version 4.

I am using very simple script that is accepting a connection and send a JSON dummy ({"abc":"abc"}) payload on an event(say 'loaddata' event) into a socket room which is created on event call(if it is not already created).

While benchmarking, if i try to make 1000 connections with 100 common subscription(100 rooms), then it starts giving disconnection error of few socket connections after few seconds.

Server(where socket code is running) Machine details : 8cpu,8Gb RAM.

After TOP command usage, it seems , CPU is over 100% when i shoot 1000 connections in a go with 100 subscription each.

is there some limitation in socket.io or i am doing some mistake or is this is the max limit for socket.io with this conn number. ?

//Server code : const app = require('express')();const server = require('http').Server(app);const {    Server} = require("socket.io");const io = new Server(server, {    path: '/abc',    transports: ['websocket']})io.on('connection', async (socket) => {    socket.emit('broadcast', `Welcome to StreamerIO `)    socket.on('dataload', (data) => {        socket.join('datafeed_'+ data.token);        sendFeed('datafeed_'+ data.token);    });});const sendFeed = (room) => {    io.to(room).emit("getdata", {"abc": "abc"    });}server.listen("7005", () => {    console.log(`Socket Server listening on ${server.address().address}:${server.address().port}`);});//Client Code :const io = require("socket.io-client");const connectFeed = async (subscription, tokens_list) => {    const socket = io('ws://localhost:7005/', {        path: "/abc",        transports: ['websocket']    });    socket.on("connect", () => {        function subscribetoken() {            if (socket.connected) {                if (tokens_list && tokens_list.length) {                    tokens_list.forEach(token => {                        socket.emit("dataload", {                            token: token                        });                    });                }            }        }        function pingpong() {            socket.emit("3");        }        setTimeout(subscribetoken, 1000)        setInterval(pingpong, 1000)    });    socket.on('getdata', function(message) {        console.log("received data");    });}const startBenchMarking = (connections, subscription, tokens_list) => {    var runConnections = () => {        for (let i = 1; i <= connections; i++) {            connectFeed(subscription, tokens_list)        }    }    runConnections();}const NO_OF_CONNECTIONS = 1000;const NO_OF_SUBSCRIPTIONS = 100;const activetokens = ["a|1", "a|2", "a|3", ........] // an array of 100 diff tokens. startBenchMarking(NO_OF_CONNECTIONS, NO_OF_SUBSCRIPTIONS, activetokens);

i tried running above scripts with diff no of connections. it is running fine with upto 950 connections. and getting disconnections problem when connections crosses 1000+.

expecting : is there some limitation in socket.io or i am doing some mistake or is this is the max limit for socket.io with this conn number. ?