Instance method takes long time for type-cheking - swift

Question

I have quite a big project that takes a long time to compile. When I checked compilation times of methods. I found that this method, for example, takes usually more than 200ms to compile. What can I do to improve this?
func processSnapshot(snapshot:DataSnapshot) {
self.numberOfUsers.text = "#Total DB (users): \(snapshot.childrenCount.description)"
for child in snapshot.children {
if let snapshot = child as? DataSnapshot,
let userProfile = UserProfile(snapshot: snapshot) {
if userProfile.picUrl == "" {
numberOfUsersWithOutPicUrl += 1
}
let todayLong = "\(Date())".prefix(10)
if userProfile.createdOnLong.prefix(10) == todayLong {
profileWizardsStartedTotday += 1
if userProfile.weight != "" {
profileWizardsCompletedTotday += 1
}
}
profiles.append(userProfile)
}
}
let numberOfUsersWithOutPicUrlPercent = round(Double(numberOfUsersWithOutPicUrl)*100/Double(numberOfRealUsers))
let sizeOfSnapshotValueInKB:Int = String(describing: snapshot.value).count / 1024
self.userThatAbortedOnBoarding.text = numberOfUsersWithOutPicUrl.description
self.userThatAbortedOnBoardingPercent.text = "\(numberOfUsersWithOutPicUrlPercent)%"
self.userThatStartedOnBoardingToday.text = profileWizardsStartedTotday.description
self.userThatCompletedOnBoardingToday.text = profileWizardsCompletedTotday.description
self.sizeOfSnapshot.text = "\(sizeOfSnapshotValueInKB.description)KB"
}
My UserProfile initializer looks like this:
init?(snapshot: DataSnapshot) {
print("\(snapshot.key) - \(String(describing: snapshot.value))")
guard
let value = snapshot.value as? [String: AnyObject],
let uid = value["uid"] as? String
else {
print("Warning: Userprofile has no UID")
return nil
}
self.uid = uid
self.email = value["email"] as? String ?? ""
self.picUrl = value["picurl"] as? String ?? ""
self.picUrl2 = value["picurl2"] as? String ?? ""
self.picUrl3 = value["picurl3"] as? String ?? ""
self.picUrl4 = value["picurl4"] as? String ?? ""
self.picUrl5 = value["picurl5"] as? String ?? ""
self.picUrl6 = value["picurl6"] as? String ?? ""
self.city = value["city"] as? String ?? ""
self.displayName = value["displayName"] as? String ?? "anonymous"
}