We have recently been transitioning our company mapping system from Google map, first to deCarta and then to OpenLayers. We have found that OpenLayers and deCarta are remarkably slower than Google Maps when many elements (several thousand) are added to the map (pins with bubbles on click). Google has the Marker Manager which appears to make it faster, but what I can't figure out is how this cuts down the memory usage or whatever to make it perform so much better. It's driving me nuts because we do the same thing with both OL and deCarta as we do with Google and the others are so slow. Does anyone have any experience in working with these systems?
I know that Google is the massive giant of mapping technology and therefore has put enormous amounts of money into the system, so it's not surprising that it's faster. I just want to know HOW if at all possible.
Thanks!