// mongoose config
require('./database');
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
//var expressValidator = require('express-validator');
var routes = require('./routes/index');
var users = require('./routes/users');
var form = require('./routes/form');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
//app.use(expressValidator);
After adding express-validator, the app slows down dramatically: why is that?