Bad performance when presenting modally over uicollectionviewcontroller on iPad - ios

Question

in have a simple uicollectionviewcontroller with some simpel views in. In the UINavigationBar i have a button, when pressed presents modally (as formsheet) segue to a navigation controller, with a tableview as rootview.
On iPhone, it all works well, but on iPad the animation when it presents and when the presented tableview scroll, is bad and have low fps.
How can this be?
Please tell what kind of information from my app is needed to help me.
I am working in swift, iOS 8.3
UPDATE:
Okay, so i got 8 different kinds of prototypecells in my tableview, all with auto-layout in my storyboard. I have a subclass for each of them with IBOutlets.
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if (indexPath.section == 0) {
if indexPath.row == 0 {
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(NSCalendarUnit.CalendarUnitWeekOfYear, fromDate: NSDate())
let cell = tableView.dequeueReusableCellWithIdentifier("weekCell", forIndexPath: indexPath) as! WeekChooserTableViewCell
cell.stepper.value = Double(components.weekOfYear)
cell.weekNumber.text = String(components.weekOfYear)
return cell
} else if indexPath.row == 1 {
let cell = tableView.dequeueReusableCellWithIdentifier("customerCell", forIndexPath: indexPath) as! CustomerTableViewCell
cell.customerTextField.tag = "\(indexPath.row+1)\(indexPath.section+1)".toInt()!
cell.customerTextField.delegate = self
return cell
}
} else if indexPath.section > 0 && indexPath.section <= 5 {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCellWithIdentifier("hourpayCell", forIndexPath: indexPath) as! HourpayTableViewCell
if arrayOfHourpay[indexPath.section-1] == 9999999999 {
cell.hourpayTextField.text = ""
} else {
cell.hourpayTextField.text = String("\(arrayOfHourpay[indexPath.section-1])")
}
cell.hourpayTextField.tag = "\(indexPath.row+1)\(indexPath.section+1)".toInt()!
cell.hourpayTextField.delegate = self
return cell
} else if indexPath.row == 1 {
let cell = tableView.dequeueReusableCellWithIdentifier("casepayCell", forIndexPath: indexPath) as! CasepayTableViewCell
if arrayOfCasepay[indexPath.section-1] == 9999999999 {
cell.casepayTextField.text = ""
} else {
cell.casepayTextField.text = String("\(arrayOfCasepay[indexPath.section-1])")
}
cell.casepayTextField.tag = "\(indexPath.row+1)\(indexPath.section+1)".toInt()!
cell.casepayTextField.delegate = self
return cell
} else if indexPath.row == 2 {
let cell = tableView.dequeueReusableCellWithIdentifier("machinepayCell", forIndexPath: indexPath) as! MachinepayTableViewCell
if arrayOfMachinepay[indexPath.section-1] == 9999999999 {
cell.machinepayTextField.text = ""
} else {
cell.machinepayTextField.text = String("\(arrayOfMachinepay[indexPath.section-1])")
}
cell.machinepayTextField.tag = "\(indexPath.row+1)\(indexPath.section+1)".toInt()!
cell.machinepayTextField.delegate = self
return cell
} else if indexPath.row == 3 {
let cell = tableView.dequeueReusableCellWithIdentifier("daycommentCell", forIndexPath: indexPath) as! DayCommentTableViewCell
cell.textView?.tag = "\(indexPath.row+1)\(indexPath.section+1)".toInt()!
cell.textView?.text = arrayOfDayComments[indexPath.section-1]
return cell
}
} else if indexPath.section == 6 {
if indexPath.row + 1 == rowsInMaterialSection {
let cell = tableView.dequeueReusableCellWithIdentifier("addMaterialCell", forIndexPath: indexPath) as! AddNewMaterialTableViewCell
return cell
} else {
let cell = tableView.dequeueReusableCellWithIdentifier("materialTextfieldCell", forIndexPath: indexPath) as! MaterialTextfieldTableViewCell
cell.MaterialTextField.text = arrayOfMaterials[indexPath.row]
cell.MaterialTextField.tag = "\(indexPath.row+1)\(indexPath.section+1)".toInt()!
cell.MaterialTextField.delegate = self
return cell
}
}
let cell = tableView.dequeueReusableCellWithIdentifier("daycommentCell", forIndexPath: indexPath) as! DayCommentTableViewCell
return cell
}