We were at first vexed and then later delighted when a bug loading data in iD led us to discover some big performance improvements for OpenHistoricalMap.org.
The details are in this Github Issue. @Minh_Nguyen was trying to map in an area in San José, California, but the data kept failing to load.
We thought we might need to just throw more resources at the server, but a timely comment from OSM contributor MMD helped steer us in the right direction.
Ruben from Development Seed got the MUCH faster CGI-map configured, and now let’s hear from Minh directly how much faster everything is:
CGImap has dramatically improved my experience as a contributor to OpenHistoricalMap. Before, I could barely upload boundary relations without JOSM timing out and retrying, and using iD sometimes felt like reverting to a dialup connection. Now I can upload and download without going out for a walk while I wait.