Your comments

thanks for your answer. At the moment the bibliography contains over 3000 entries but a big update (from 3000 to 6000) will be made in the coming weeks. The CMS is wordpress and the add-on/plugin used is TeachPress.We have a couple of issues Firstly, the database is relatively slow when searching and the update will likely make it worst. Secondly, we would like to link the database to Zotero but it's currently not possible with Teachpress and the developpers are not really supportive. So a solution for us would be using BibBase linked to a Zotero database, with a search bar and a tagcloud... http://www.collapsologie.fr/veille-biblio/  Many thanks for your help