Download multiple files Dompdf

I have a bunch of pdf reports I want to download all at once, right now there are as many as 150, I have a method for downloading a single pdf and that works ok, it's really slow to load. I want to know if there is a way I can download all of the reports at once.

This is the single download pdf function, this pdf report is for a survey results, so all the questions and a % of answered options.

public function pdf($id)
    {
        $survey = Survey::with('surveyQuestions.responseType',
            'surveyQuestions.surveyQuestionOption', 'surveyQuestions.answer')
            ->where('id', $id)->first();

        $Eid = Evaluation::where('survey_id', $id)->pluck('id')->first();
        $evaluators = EvaluationEvaluator::where('evaluation_id', $Eid)->with('group.users')->get();


        if ($evaluators[0]->user_id == null) {
            $tot = $evaluators[0]['group']['users']->count();
        } else {
            $tot = $evaluators->count();
        }


        $totalAnswered = SurveyAnswer::where('survey_id', $survey->id)->selectRaw('COUNT(DISTINCT user_id) as count')
            ->value('count');

        $result = [];


        foreach ($survey['surveyQuestions'] as $question) {
            $options = [];

            if ($question->response_type_id === 1) {
                foreach ($survey['answer'] as $answer) {
                    if ($question['pivot']->survey_id === $survey->id) {
                        if ($answer->survey_question_id === $question->id) {
                            $options[$answer->id] = [
                                'title' => $answer->answer,
                                'vote_count' => null
                            ];
                        }
                    }
                }
            }

            if ($question->response_type_id === 2) {

                $mul_total = SurveyAnswer::where('survey_id', $survey->id)->where('survey_question_id', $question->id)
                    ->selectRaw('COUNT(DISTINCT user_id) as count')
                    ->value('count');

                foreach ($question['surveyQuestionOption'] as $option) {

                    if ($question['pivot']->survey_id === $survey->id) {
                        $mul_count = 0;

                        foreach ($survey['answer'] as $answer) {
                            if ($answer->survey_question_id === $option->survey_question_id
                                && (int)$answer->answer === $option->id) {
                                $mul_count++;
                            }

                            $options[$option->id] = [
                                'title' => $option->option,
                                'vote_count' => $mul_count,
                                'total' => $mul_total
                            ];
                        }
                    }
                }
            }

            if ($question->response_type_id === 3) {
                if ($question->rank === 3) {
                    $question->opciones = [
                        ['id' => 1, 'option' => 1],
                        ['id' => 2, 'option' => 2],
                        ['id' => 3, 'option' => 3]
                    ];
                } else if ($question->rank === 4) {
                    $question->opciones = [
                        ['id' => 1, 'option' => 1],
                        ['id' => 2, 'option' => 2],
                        ['id' => 3, 'option' => 3],
                        ['id' => 4, 'option' => 4]
                    ];
                } else if ($question->rank === 5) {
                    $question->opciones = [
                        ['id' => 1, 'option' => 1],
                        ['id' => 2, 'option' => 2],
                        ['id' => 3, 'option' => 3],
                        ['id' => 4, 'option' => 4],
                        ['id' => 5, 'option' => 5]
                    ];
                } else {
                    $question->opciones = [
                        ['id' => 1, 'option' => 1],
                        ['id' => 2, 'option' => 2],
                        ['id' => 3, 'option' => 3],
                        ['id' => 4, 'option' => 4],
                        ['id' => 5, 'option' => 5],
                        ['id' => 6, 'option' => 6]
                    ];
                }

                $rk_total = SurveyAnswer::where('survey_id', $survey->id)->where('survey_question_id', $question->id)
                    ->selectRaw('COUNT(DISTINCT user_id) as count')
                    ->value('count');

                foreach ($question['opciones'] as $opt) {
                    $rk_count = 0;

                    foreach ($question['answer'] as $answer) {
                        if ($answer->survey_id === $survey->id) {
                            if ($answer->survey_question_id === $question->id && (int)$answer->answer === $opt['option']) {
                                $rk_count++;
                            }

                            $options[$opt['id']] = [
                                'title' => $opt['option'],
                                'vote_count' => $rk_count,
                                'total' => $rk_total
                            ];
                        }
                    }
                }
            }

            if ($question->response_type_id === 4) {
                $question->opciones = [
                    ['id' => 1, 'option' => 'Si'],
                    ['id' => 2, 'option' => 'No']
                ];

                $total = SurveyAnswer::where('survey_id', $survey->id)->where('survey_question_id', $question->id)
                    ->selectRaw('COUNT(DISTINCT user_id) as count')
                    ->value('count');

                foreach ($question['opciones'] as $opt) {

                    $count = 0;
                    foreach ($question['answer'] as $answer) {
                        if ($answer->survey_id === $survey->id) {
                            if ($answer->survey_question_id === $question->id && $answer->answer === $opt['option']) {
                                $count++;
                            }

                            $options[$opt['id']] = [
                                'title' => $opt['option'],
                                'vote_count' => $count,
                                'total' => $total
                            ];

                        }
                    }
                }
            }

            $result[] = [
                'id' => $question->id,
                'type' => $question->response_type_id,
                'rank' => $question->rank,
                'num' => $question->num,
                'title' => $question->question,
                'options' => $options
            ];
        }
        $data = Survey::with('surveyQuestions.responseType')->where('id', $id)->first();

        $data['result'] = $result;
        $data['totalSent'] = $tot;
        $data['totalAnswered'] = $totalAnswered;

        $pdf = App::make('dompdf.wrapper');
        $pdf->loadView('pdf.report', ['survey' => $data]);
        return $pdf->stream();
    }

This is what I tried for the downloadAll function, however understandably this give me a timeout error, a single pdf takes about 15-20 seconds to load which is incredibly slow.

public function downloadAllReports()
    {
        $now = Carbon::now();

        $report = Evaluation::with('survey')
            ->whereDate('report_date', '<=', $now)
            ->whereDate('report_end', '>=', $now)
            ->where('report', true)
            ->whereHas('survey', function ($query) {
                $query->where('user_id', auth()->user()->id);
            })
            ->orderBy('updated_at', 'desc')
            ->get();


        foreach ($report as $item) {
            $this->pdf($item->id);
        }
    }

What is my best option here to download all the reports, also if there is a way to make the pdf load faster that would be great.