Comment 4 for bug 547133

Indeed, performance needs to be kept in mind. One way could be to allow using filters to limit revisions and/or files.

I would not expect performance to be a limitation though even without the filters. There are a pile of software applications which handle very large data-sets and represent them in GUI in practically real-time. Software tools used by the IC design industry come to mind as the oldest examples. (ICs have millions of transistors, each represented by several polygons. The tools used to make IC layout show them on the screen in real-time.)