Imperative vs. FRP swift performance

gistfile1.txt

  func test1Imperative() {
    
    class Counter {
      var count: Int = 0 {
        didSet {
          realCount = count+1
        }
      }
      var realCount: Int = 0
    }
    
    var counter = Counter()
    
    for i in 1..<100000 {
      counter.count = i
    }
    
  }