Why Xcode6.3.2 Compiling swift source files TOO SLOW, When I write down this code

Question

When I write down these codes snippets:

import UIKit

class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    var homeCellArr: [Dictionary <String, String>] = [
        ["name": "eee", "pic": "newsIcon"],
        ["name": "dcd", "pic": "taskIcon"],
        ["name": "ccccc", "pic": "cardIcon"],
        ["name": "bbbb", "pic": "mailIcon"],
        ["name": "aa", "pic": "optionIcon"]
    ]
    override func viewDidLoad() {
        ......

I found Building and Indexing became too slow

And CODE Autocomplete also became slow slow slow IN THIS Swift File

Such as I write self. I must wait 6s or 7s, before autocomplete show up

How to fix this problem?

---

When I noted these codes

 //       var homeCellArr: [Dictionary <String, String>] = [
 //           ["name": "eee", "pic": "newsIcon"],
 //           ["name": "dcd", "pic": "taskIcon"],
 //           ["name": "ccccc", "pic": "cardIcon"],
 //           ["name": "bbbb", "pic": "mailIcon"],
 //           ["name": "aa", "pic": "optionIcon"]
 //       ]

The speed of code autocomplete turn normal