Ajax请求加载时间过长

我有一个关于传奇联盟的网站。我要求从防暴游戏API根据玩家的名字统计。然后我得到json上的信息。然后，我使用ajax将信息从php页面获取到主页面。但加载确实需要很长时间。我注意到它每秒钟读取一个json注册表。

这是我的ajax代码：

function getStats (SUMMONER_ID, API_KEY) {
  var Topuser = SUMMONER_ID
  var theStatsDiv = document.getElementById('deaths')
  $.ajax({
    url: 'getKey.php',
    type: 'post',
    dataType: 'json',
    async: false,
    data: {urlLinked: 'https://' + regionSelected + '.api.pvp.net/api/lol/' + regionSelected + '/v1.3/stats/by-summoner/' + SUMMONER_ID + '/ranked?season=SEASON2016&api_key='},
    success: function (json) {
      var user = Topuser
      for (var i = 0; i < json.champions.length; i++) {
        if (json.champions[i].id != 0) {
          var wins = json.champions[i].stats.totalSessionsWon
          var loses = json.champions[i].stats.totalSessionsLost
          var $div = $('<div>', {id: 'champion' + i, class: 'championClass', 'percentage': wins + loses})
          $('#deaths').append($div)
          var ratio = 0
          if (wins == 0) {
            ratio = 0
          }
          if (loses == 0) {
            ratio = 100
          }
          if (wins != 0 && loses != 0) {
            ratio = (wins / (wins + loses)) * 100
            ratio = ratio.toFixed(0)
          }

          $.ajax({
            url: 'getKey.php',
            type: 'post',
            dataType: 'json',
            async: false,
            data: {urlLinked: 'https://global.api.pvp.net/api/lol/static-data/' + regionSelected + '/v1.2/champion/' + json.champions[i].id + '?api_key='},
            success: function (json) {
              championIcon = json.name
              var tempDif = 0
              tempDif = wins - loses
              if (tempDif > maxDifference) {
                difChampionName = ''
                maxDifference = 0
                maxDifference = tempDif
                maxRatio = ratio
                difChampionName = json.name
              }
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {
              var user = Topuser
              console.log(errorThrown)
              if (errorThrown === 'Not Found') {
              }
            }
          })
          var result = championIcon.replace(/[^A-Z0-9]+/ig, '')
          $('#champion' + i).append('<div class="championWrapper" id="championWrapper' + i + '">')
          $('#championWrapper' + i).append('<p class="championName">' + championIcon + '</p><br>')
          $('#champion' + i).css('background-image', 'url(http://ddragon.leagueoflegends.com/cdn/img/champion/splash/' + result + '_0.jpg)')

          if (ratio >= 50) {
            $('#championWrapper' + i).append("Stuff.....")
          }
          if (ratio < 50) {
            $('#championWrapper' + i).append("More stuff.....")
          }
        }
      }
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
      var user = Topuser
      console.log(errorThrown)
      if (errorThrown === 'Not Found') {
        document.getElementById('deaths').innerHTML = 'not found'
      }
    }
  })
}

我能做些什么来使ajax调用运行得更快？我还有另外两个函数，但它们只从json数组中读取一个内容。非常感谢您抽出时间。很抱歉我的英语不好，如果代码看起来不好也很抱歉。