my Node.js Application's reaction rate is very slow

Question

First, I'm not good at speaking English.

I'm trying to write code as Node.js based on Fingersquared in Raspberry Pi.

So, I want just control my RPi'GPIO. But when I click the button, console.log shows very slowly or not at all (but when I click each buttton at first time very quickly react)

When I check the cpu rate, it is just normal (less than 2%).

what is my fault ? :(

app.js

var express = require('express')
 , routes = require('./routes')
 , http = require('http')
 , path = require('path')
 , gpio_led = require('./routes/led');

var app = express();

app.configure(function(){
  app.set('port', process.env.PORT || 52237);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
});

app.configure('development', function(){
  app.use(express.errorHandler());
});

app.get('/', routes.index);
app.get('/led/:num/:switch', function(req,res){
        var num = req.params.num
          , sw  = req.params.switch;

        console.log('LED ' + num + ' is ' + sw + '.');
        //gpio_led(num,sw);
})


http.createServer(app).listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});

index.jade

extends layout

block content
        .row
                .six.columns.centered
                        .panel
                                .row
                                        h4.text-center LED_01
                                        .six.columns.text-center
                                                a.button.large.right.LED1_ON ON
                                        .six.columns
                                                a.button.large.left.LED1_OFF OFF
                                .row
                                        hr
                                        h4.text-center LED_02
                                        .six.columns
                                                a.button.large.right.LED2_ON ON
                                        .six.columns
                                                a.button.large.left.LED2_OFF OFF
                                .row

        script(type='text/javascript')
                $('.LED1_ON').on('click', function(){
                        $.get('/led/1/on');
                });
                $('.LED1_OFF').on('click', function(){
                        $.get('/led/1/off');
                });

Answer 1

Add a res.send('ok') to your handlers. The browser is waiting for a response to the first button click and never gets it. That is probably what is causing the delay.