WebIDE times out trying to load a very large repo

Summary

For a large repository on a self-managed Omnibus GitLab install, we want to use the WebIDE in GitLab, however it appears to time out when trying to load initially.

Example Project

What is the current bug behavior?

TBD

What is the expected correct behavior?

WebIDE should load and allow user to browse files, and select files for editing. A limited set of branches or changes would be sufficient.

Relevant logs and/or screenshots

We will attach logs as soon as we can generate them again.

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(we will only investigate if the tests are passing)