Project Overview/Details page load time too long causing many tests to fail

Summary

It appears that occasionally Project Overview / Details page would take a lot of time to render all page elements, too long that some tests could not wait and fail.

Job	Failed Test	Error
https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/471452119, https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/470099323	qa/specs/features/browser_ui/1_manage/group/transfer_project_spec.rb	Unable to find link or button "README.md"
https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/470964009, https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/470248526	qa/specs/features/browser_ui/3_create/repository/push_over_http_spec.rb	Failure/Error: expect(page).to have_content('README.md')
https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/470372107	qa/specs/features/ee/browser_ui/3_create/repository/code_owners_spec.rb	Unable to find link or button "file.txt"

Also found in #210489 (closed)

Screenshot / HTML page

Sample screenshot from one of the failed tests because of page not finish rendering elements

Possible fixes

@ddavison says it's possible that dynamic element validation could help remedy this