Description
Customers have reported poor macro loading times, especially when used inside of Page Property Reports. The most common case seems to be that we encounter the performance issue when a large number of macro's are displayed on a single page (50 - 70, or more). If the amount of macro's are sufficient, macro's will load slowly and in drips and drabs.
Cause
Atlassian only allows 6 connections from the same origin at a time, hence leading to the stalled requests. Each individual iframe (which our macros are in) creates a connection and request, and subsequently stalls until resources become available.
We already made our macro's cacheable according to Atlassian guidelines and also implemented our own browser caching of static resources.
