TableView lagging too far and taking up too much memory Swift

I have an application that uses a UITableView inside a UIViewController and the way each cell is rendered is issue information or blog posts that are stored in CoreData after they are loaded. But when I ran the tools tool, I found out that every time you scroll down or up, it retrieves this CoreData. Even if the cell has already been initialized, so this in combination with explicitly NSDate also takes up some kind of memory. The program takes up about 40m bar and about 60% cpu when scrolling down! And I searched for answers as soon as initialize it once, but could find it anywhere. Here's my TableView code:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("tableviewcell", forIndexPath: indexPath) as! BlogTableViewCell

    let sortedPosts = SortPosts()
    let realresults = sortedPosts.sortData()




    if realresults.count > 0 {
        println(cell)
        let date = realresults[indexPath.row].valueForKey("date") as? NSDate
        let numberOfTime = PostDateFormatter().getFormattedDate(date!)
        let content = realresults[indexPath.row].valueForKey("content") as! String
        let title = realresults[indexPath.row].valueForKey("title") as! String

        cell.configureCell(Post(title: title.html2String, author: realresults[indexPath.row].valueForKey("author") as! String, date: numberOfTime, content: content.html2String))
        tableView.hidden = false
        self.view.backgroundColor = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 255.0/255.0)
        myIndicator.stopAnimating()
        myIndicator.hidden = true
        }
    else {
        if PostServices().isConnectedToNetwork() {
            println("Error 0 results returned......")
            self.tableView.reloadData()
        }

    }

    return cell
}

      

        
        
        
      

    

and here it is SortPosts:

class SortPosts {
func sortData() -> NSArray {
    var jsonin = NSArray()

    let formatter = NSDateFormatter()
    formatter.dateFormat = "Y-MM-dd\'T\'HH:mm:ss"

    var managedObjectContext : NSManagedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext!

    var request = NSFetchRequest(entityName: "Post")
    request.returnsObjectsAsFaults = false

    let sortDescriptor = NSSortDescriptor(key: "date", ascending: false)
    request.sortDescriptors = [sortDescriptor]

    var results : NSArray = managedObjectContext.executeFetchRequest(request, error: nil)!

    return results



}

      

        
        
        
      

    

}

And here's the PostDateFormatter:

class PostDateFormatter {
func getFormattedDate(date : NSDate) -> String {
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle
let dateInShortFormat = dateFormatter.stringFromDate(date)

let inter = date.timeIntervalSinceNow

var seconds = Int(abs(inter))
var minutes = seconds/60
var hours = minutes/60
var days = hours/24
var weeks = days/7


if seconds < 60 {
return "\(seconds)s"
} else if minutes < 60 {
return "\(minutes)m"
} else if hours < 24 {
return "\(hours)h"
} else if days < 7 {
return "\(days)d"
} else if weeks <= 8 {
return "\(weeks)w"
} else if weeks > 8 {
return "\(dateInShortFormat)"
}
    return "Something went wrong with date formatting"
}

      

        
        
        
      

    

}