UITableView scrolling freezes when I scroll with firebase realtime database retrieval

Question

I am fetching some data from firebase and showing it to the UITableView but each time when I scroll the tableview it freezes for 2-3 second.Here is the UITableViewDataSource

 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        list.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIndetifire) as? HallListCell else {
            return UITableViewCell()
        }
        cell.configure(list: list[indexPath.row])
        return cell
    }

and here is the loadData function which observe and fetch data from firebase and reload the UITableView

func loadData(){
        guard let uid = currentUID else {
            return
        }
        list.removeAll()
        self.ref.child("users/\(uid)").child("SWITCH/HALL").observe(.childAdded, with: { (snapshot) -> Void in
         
            guard let value = (snapshot.value)  as? [String : String] else {
                return
            }
            guard let name = value["name"],let img = value["img"], let status = value["status"]  else {
                return
            }
            self.list.append(DataModel(name: name, img: img, status: status,keyPrimices: "HALL",keyAppliances: snapshot.key))
            DispatchQueue.main.async {
                self.tblListOfHallAppliances.reloadData()
                self.tblListOfHallAppliances.isHidden = false
                self.activityIndicator.isHidden = true
            }
            
        })
    }

code in cell.configure(list: list[indexPath.row]) is written below which is placed in cell

func configure(list: DataModel) {
        keyPrimices = list.keyPrimices
        keyAppliances = list.keyAppliances
        lblAppliancesName.text = list.name
        switchStauts.isOn = (list.status == "ON")
        
        switch keyAppliances {
        case "FAN":
            list.status == "ON" ? imgIcon.fanAnimation() : imgIcon.fanAnimationStop()
        case "LIGHT":
            list.status == "ON" ? imgIcon.lightAnimation() : imgIcon.lightAnimationStop()
        case "AC":
            list.status == "ON" ? imgIcon.acAnimation(): imgIcon.acAnimationStop()
        case "TV":
            list.status == "ON" ? imgIcon.tvAnimation(): imgIcon.tvAnimationStop()
        default:
            if let url = URL(string: list.img) {
                loadImage(url: url, imageOutlet: imgIcon)
            }
        }
    }

UIImageView extension is below

extension UIImageView {
    func fanAnimation() {
        let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotation.toValue = NSNumber(value: Double.pi * 2)
        rotation.duration = 0.5
        rotation.repeatCount = Float.greatestFiniteMagnitude
        self.image = UIImage(named: "fan")
        self.layer.add(rotation, forKey: "rotationAnimation")
        
    }
    
    func fanAnimationStop() {
        self.layer.removeAllAnimations()
        self.image = UIImage(named: "fan")
    }
    
    func lightAnimation() {
        let animation = CABasicAnimation(keyPath: #keyPath(CALayer.opacity))
        animation.fromValue = 0.2
        animation.toValue = 1.0
        animation.duration = 0.5
        animation.autoreverses = true
        animation.repeatCount = Float.greatestFiniteMagnitude
        self.image = UIImage(named: "light_on")
        self.layer.add(animation, forKey: "fade")
    }
    func lightAnimationStop() {
        self.layer.removeAllAnimations()
        self.image = UIImage(named: "light_off")
    }
    func acAnimation () {
        let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotation.toValue = NSNumber(value: Double.pi/9)
        rotation.fromValue = NSNumber(value: -Double.pi/9)
        rotation.duration = 0.5
        rotation.autoreverses = true
        rotation.repeatCount = Float.greatestFiniteMagnitude
        self.image = UIImage(named: "ac_on")
        self.layer.add(rotation, forKey: "acAnimation")
    }
    func acAnimationStop() {
        self.layer.removeAllAnimations()
        self.image = UIImage(named: "ac_off")
    }
    
    func tvAnimation () {
        let rotation = CABasicAnimation(keyPath: "transform.scale")
        rotation.toValue = NSNumber(value: 1)
        rotation.fromValue = NSNumber(value: 0.5)
        rotation.duration = 0.5
        rotation.autoreverses = true
        rotation.repeatCount = Float.greatestFiniteMagnitude
        self.image = UIImage(named: "tv_on")
        self.layer.add(rotation, forKey: "tvAnimation")
    }
    func tvAnimationStop() {
        self.layer.removeAllAnimations()
        self.image = UIImage(named: "tv_off")
    }
}