Server-side clustering for mapping in Drupal 7 based on Geohash: Geocluster increases performance of data-heavy map visualizations by clustering results on the server-side.
Client-side JavaScript libraries like Leaflet Markercluster enhance performance and readability of data-heavy maps by clustering points. But still, all data needs to be rendered by Drupal, transferred to the client and processed on a potentially slower end user device. By clustering data on the server-side, the load is shifted from the client to the server which allows displaying larger amounts of data in a performant way.
A super phone (html5 and ajax) ready form to collect sequential boolean data using a multistep form. Including a corresponding content type:sample so it can be searched.