Issue Summary

If a roadmap (plans) takes more than 10 seconds to load on Jira, it will fail to load when embedded in a Confluence page.

Steps to Reproduce

1. Create an advanced roadmap on jira (plan) for a new project
2. create 11k issues or more on that project
3. paste the roadmap's link to a confluence page and publish it

Expected Results

The page should load, taking a similar time as Jira does to load the roadmap

Actual Results

The roadmap fails to load, with an error after 10 seconds. The request to /wiki/plugins/servlet/portfolio-proxy fails with a 504 (gateway timeout) after 10 seconds.

Workaround

Decrease the number of issues listed in the plan, in order to decrease the loading time to 10s
or less.