Why my nodejs requests are slow? - node.js

Question

Im new in nodejs, and Im trying to learn by creating an app that has a list of users, that I can add and remove those users. Im using angularjs in frontend to send request to nodejs and after that to mongodb. The problem is that, if I click a lot of times in the button "adduser" a lot of times, my app goes slow.
To interact to mongodb I use:
app.get('/users',function (req, res) {
mongoose.model('Usuario').find(function (err, list) {
res.send(list);
});
});
app.post('/addusuario', function (req,res) {
var usuario = new Usuario(req.body);
usuario.save(function (err) {
if (err) {
console.log(err);
} else {
console.log('Usuario salvo com sucesso');
}
}); });
app.delete('/delusuario/:id', function (req, res) {
var id = req.params.id;
mongoose.model('Usuario').findByIdAndRemove(id , function(err) {
if(err) {
console.log(err);
} else {
console.log('Usuario removido com sucesso!');
}
});
});
Im my angularapp:
app.controller('AppCtrl', function($scope, $http, Data) {
function reload() {
Data.get('users').then(function(data){
$scope.usuarios = data;
console.log(data);
});
};
$scope.addUsuario = function(usuario) {
Data.post('/addusuario', usuario);
reload();
};
$scope.deletarUsuario = function(id) {
Data.delete("/delusuario/"+id).then(function(result) {
});
reload();
};
reload();
});
I dont know why it is becaming slow after I click to add user more than 3 times..

Answer 1

What I see in your code that you are not sending an response back to the user, you should do something after insert or delete in the database. res.end();
You should rewrite your code in the following way:
app.get('/users',function (req, res) {
mongoose.model('Usuario').find(function (err, list) {
res.send(list);
});
});
app.post('/addusuario', function (req,res) {
var usuario = new Usuario(req.body);
usuario.save(function (err) {
if (err) {
console.log(err);
res.json({err: err});
} else {
res.json({ok: true});
console.log('Usuario salvo com sucesso');
}
}); });
app.delete('/delusuario/:id', function (req, res) {
var id = req.params.id;
mongoose.model('Usuario').findByIdAndRemove(id , function(err) {
if(err) {
console.log(err);
res.json({err: err});
} else {
res.json({ok: true});
console.log('Usuario removido com sucesso!');
}
});
});
You block the stack by not returning the response to the client. And this is most probably the cause of your slow request.