cacheAsBitmap to increase performance?

I have broken down my application to the bare basics (i think)…the following link shows my application with minimal functionality…you can zoom and pan the map…no tool tips, no fancy hand cursors, barely and listeners, and no gradients on the booths…

www.expocadvr.com/skinny/default.html

This next link is to the plan in its full functionality/graphics look…has gradients, mouse cursors, tool tips, booth flyovers…and it is not that much slower than my skinny version…so I have decided that maybe the size of the floorplan is too big…(load '07 Demo to see the same show as in the skinny version)

www.expocadvr.com/new/default.html

It is read in from an xml which contains the coordinates for each object on the plan…each line, booth, and everything else…the load shows all the shapes being drawn…

Would I gain a lot of performance by putting the building drawing, which is completely uninteractive, into a bitmap? Then just have all the booths as vector drawings? Please help, this is really making my application useless!