The Multi-Wiki-Server plugin will provide TiddlyWiki clients access to large media files - it also provides the framework for JS developers to interface to SQLite databases. This would allow TiddlyWiki clients relational access to small and large volumes of data stored server-side.
By quering the databases for only the data requested, wrapping the data in tiddler(s) (if not already stored as a tiddler), and sending to the client solves the problems with the refresh mechanism and performance issues client-side; which @pmario so rightfully describes in the prior post Idea of multi field data tiddler like a data base - #2 by pmario.
However, still months away 
- but the future looks so bright - kitty will need shades.