Very slow JSON parsing using EVReflection depending on iOS device

Question

I am obtaining a json object containing an array of objects. I am willing to parse this json using the lib EVReflection.

The operation takes a while, so I decided to monitorize the steps I'm taking, and realized the parsing of the json can take up to 20 seconds depending on the device.

Using iPhone SE / iOS 11.4 it takes 4 seconds aprox.
Using iPhone 5 / iOS 10.3 it takes 20 seconds aprox.

I am wondering if such variation is normal just depending on devices/OS.

Should I just use another lib or is there anything I can do to speed up the operation?

This is the code I'm using:

func getParkings(update: Bool) -> Observable<[ParkingEvo]> {
        if let x = parkings, !update {
            return Observable.just(x)
        } else {
            print("STEP 1: Calling API for parkings \(NSDate())")
            return RxAlamofire.string(.get, PARKINGS_URL, parameters: getParameters(), headers: nil)
                .map { self.parseParkings(json: $0) }
                .do(onNext: { self.storeParkings($0) })
        }
    }

private func parseParkings(json: String) -> [ParkingEvo]{
        print("STEP 2: Proceed to parse json \(NSDate())")
        let parkingsDTO = ParkingsDTO(json: json)
        print("STEP 3: ParkingsDTO created \(NSDate())")

        return parkingsDTO.items
    }

Between STEP2 and STEP3 there is the mentioned delay. Any idea on how to optimize this?

Thank you in advance.

Answer 1

Try SwiftyJSON for parsing instead it is fast an easy check Hacking with swift

It is project 7 which you need to check

Answer 2

For the record I ended up using ObjectMapper instead of EVReflection and spared 80% of the parsing time.