panel caching

[hafen]

Instead of rendering page by page, for a fixed state of filtering, sorting, sampling, and panel layout, start to build a cache of hidden divs containing each page's rendered content.

Thus when the user clicks next, if the next page has been pre-cached, it will simply load quickly, otherwise, it will trigger the output to be rendered the usual way. Users typically stop to study the current page for a small amount of time, so it would be good to remove the page changing latency by rendering it while they are viewing.

I think the best way to do this is by a specially-numbered div for each page and a special shiny output that keeps triggering more data to be sent as it keeps rendering.