502 when loading large discussions with direct note link

When looking at gitlab-com/www-gitlab-com!16021 (merged) , I noticed that it takes a long time to load the discussions. (>60,000ms).

Screenshot_2018-11-20_at_11.45.02

When I try to load discussions with a direct note link (gitlab-com/www-gitlab-com!16021 (comment 117408183)) on this page, I receive a 502 error as shown in the image below.

Screenshot_2018-11-20_at_11.31.27

As a result, the page does not show the discussions.

Screenshot_2018-11-20_at_11.42.31

This is on Firefox and I cannot recreate the error on Chrome.