### Summary Clicking the `diff` link to expand/collapse the changes in an MR takes longer than 10 seconds and may sometimes take up to 30 seconds to function. ### Steps to reproduce Simply go to the changes tab in an MR and click the `>` or ↓ to replicate the problem. ### What is the current *bug* behavior? It takes over 10 seconds to load the diff window for that file. ### What is the expected *correct* behavior? It should expand the diff window to expand/collapse right away. ### Relevant logs and/or screenshots Screenshot can be found in the ticket. ### Related Ticket: https://gitlab.zendesk.com/agent/tickets/129167 ### GitLab Version GitLab.com, GitLab Enterprise Edition 12.2.0-pre 92ddd57978c