If the sections are large and has many links, templates, cxserver will take a good amount of time to finish the processing.
For example, big tables in en:List_of_English_football_champions, like one in section "Football League First Division (1892–1992)".
The request will timeout in that cases. In the case of the above table, I observed that the request did not finish in 2minutes and timed out.
This ticket is to analyse and detect bottlenecks if any in the processing that we can improve and reduce the time.