Another simple plugin that allows you to cache a map layer and only update it when you want it to. In addition you can supply a map size and offset.

more details here:

http://trezsoft.wordpress.com/2012/07/28/tiles-play-part-3/

This plugin is also used in the two demos for the Value Tile Plugin http://impactjs.com/forums/code/tile-value-plugin.

Source Code:

https://github.com/trezsoft/Dynamic-Map-Plugin