Question: If I just want to set a label by code, I should write for example like this,

```
let label = UILabel()
label.frame = CGRect(x:10, y:   10, width:160, height:30)
label.text = "Test"
self.view.addSubview(label)

```

but if I want to set a label in a cell of tableView, how can I set it?

Thanks!

Answer: 
The problem is not the CSS, you could have the same class many times and that wouldn't affect the performance... You're calling `bundle.js` multiple times and since it's a bundle it contains a lot of Javascript code and that off course is gonna slow down your browser.
I solved this problem removing the 'bundle.js' calling in my 'index.html' file.