Pipeline view causes browser to become unresponsive when you have multiple matrix jobs with needs:

Summary

When you create a pipeline similar to the one defined below with multiple matrix jobs and where each job needs: the previous job. When you then visit the pipeline the browser becomes unresponsive (tested with latest Chrome/Firefox and with other users).

Steps to reproduce

Run the following pipeline:

stages:
  - stage1
  - stage2
  - stage3
  - stage4

job1:
  stage: stage1
  script:
    - echo "job1 $VARIANT"
  rules:
    - if: $CI_MERGE_REQUEST_IID
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
  parallel:
    matrix:
      - VARIANT:
          - one
          - two
          - three
          - four
          - five
          - six
          - seven
          - eight
          - nine
          - ten

job2:
  stage: stage2
  script:
    - echo "job2 $VARIANT"
  needs: ["job1"]
  rules:
    - if: $CI_MERGE_REQUEST_IID
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
  parallel:
    matrix:
      - VARIANT:
          - one
          - two
          - three
          - four
          - five
          - six
          - seven
          - eight
          - nine
          - ten

job3:
  stage: stage3
  script:
    - echo "job3 $VARIANT"
  needs: ["job2"]
  rules:
    - if: $CI_MERGE_REQUEST_IID
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
  parallel:
    matrix:
      - VARIANT:
          - one
          - two
          - three
          - four
          - five
          - six
          - seven
          - eight
          - nine
          - ten

job4:
  stage: stage4
  script:
    - echo "job4 $VARIANT"
  needs: ["job3"]
  rules:
    - if: $CI_MERGE_REQUEST_IID
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
  parallel:
    matrix:
      - VARIANT:
          - one
          - two
          - three
          - four
          - five
          - six
          - seven
          - eight
          - nine
          - ten