Reasons for the slow work of api Yandex metrics on php?

Question

PHP

Hello, why is this code very slow?

class APImetrika{

  private $token 	    = YA_TOKEN;
  private $url_api    = "https://api-metrika.yandex.ru/";
  private $counter_id = YA_ID;

  public function get_traffic($date1, $date2){

    return $this->get_data(
      $this->url_api.
      "stat/v1/data?id=".
      $this->counter_id.
      "&metrics=ym:s:users,ym:s:visits,ym:s:pageviews".
      "&pretty=1".
      "&date1=".$date1.
      "&date2=".$date2.
      "&oauth_token=".
      $this->token
    );
  }

  private function get_data($url){

    if($url){

      $ch = curl_init();
      curl_setopt($ch, CURLOPT_URL, $url);
      curl_setopt($ch, CURLOPT_HEADER, 0);
      curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
      curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
      curl_setopt($ch, CURLOPT_TIMEOUT, 30);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

      $data = json_decode(
        curl_exec($ch), true
      );

      curl_close($ch);

      if(is_array($data)){

        return $data;
      }
    }

    return false;
  }
}

$obj = new APImetrika();

$today = $obj->get_traffic(
  date("Ymd"),
  date("Ymd")
);
$last  = $obj->get_traffic(
  date("Ymd", strtotime("-1 days")),
  date("Ymd", strtotime("-1 days"))
);

$last2  = $obj->get_traffic(
  date("Ymd", strtotime("-2 days")),
  date("Ymd", strtotime("-2 days"))
);

$last3  = $obj->get_traffic(
  date("Ymd", strtotime("-3 days")),
  date("Ymd", strtotime("-3 days"))
);

$last4  = $obj->get_traffic(
  date("Ymd", strtotime("-4 days")),
  date("Ymd", strtotime("-4 days"))
);

$last5  = $obj->get_traffic(
  date("Ymd", strtotime("-5 days")),
  date("Ymd", strtotime("-5 days"))
);

$last6  = $obj->get_traffic(
  date("Ymd", strtotime("-6 days")),
  date("Ymd", strtotime("-6 days"))
);

Here is the chart code:

if ($('#traffic-chart').length) {
        var chart = new Chartist.Line('#traffic-chart', {
            labels: ['<?=date("d.m.y", strtotime("-6 days"));?>',
      '<?=date("d.m.y", strtotime("-5 days"));?>', 
      '<?=date("d.m.y", strtotime("-4 days"));?>', 
      '<?=date("d.m.y", strtotime("-3 days"));?>', 
      '<?=date("d.m.y", strtotime("-2 days"));?>', 
      '<?=date("d.m.y", strtotime("-1 days"));?>', 
      ''],
            series: [
            [<?php echo($last6["totals"][0]);?>, <?php echo($last5["totals"][0]);?>, <?php echo($last4["totals"][0]);?>, <?php echo($last3["totals"][0]);?>, <?php echo($last2["totals"][0]);?>, <?php echo($last["totals"][0]);?>, <?php echo($today["totals"][0]);?>],
            [<?php echo($last6["totals"][1]);?>, <?php echo($last5["totals"][1]);?>, <?php echo($last4["totals"][1]);?>, <?php echo($last3["totals"][1]);?>, <?php echo($last2["totals"][1]);?>, <?php echo($last["totals"][1]);?>, <?php echo($today["totals"][1]);?>],
            [<?php echo($last6["totals"][2]);?>, <?php echo($last5["totals"][2]);?>, <?php echo($last4["totals"][2]);?>, <?php echo($last3["totals"][2]);?>, <?php echo($last2["totals"][2]);?>, <?php echo($last["totals"][2]);?>, <?php echo($today["totals"][2]);?>]
            ]
        }, {
            low: 0,
            showArea: true,
            showLine: false,
            showPoint: false,
            fullWidth: true,
            axisX: {
                showGrid: false
            }
        });

        chart.on('draw', function(data) {
            if(data.type === 'line' || data.type === 'area') {
                data.element.animate({
                    d: {
                        begin: 2000 * data.index,
                        dur: 2000,
                        from: data.path.clone().scale(1, 0).translate(0, data.chartRect.height()).stringify(),
                        to: data.path.clone().stringify(),
                        easing: Chartist.Svg.Easing.easeOutQuint
                    }
                });
            }
        });
    }

Answer 1

Most likely, you need to make 1 request and split the information by date, and not make 5 requests for each day.
The API, in theory, should contain such an opportunity to query immediately the period of dates