Slow loading of 12-addresses - not creating maps cache

I am still having issues with pages with 12-locations taking forever to load. The first 4-5 points seem to load immediately but then it goes to a crawl taking many minutes to load the rest.

The "_promaps_cache" directory nor info is being built.

The page is here: Host_Locations.htm

I was looking at the generated code and if I understand it correctly (I am not a js person), it seems to look for a file before doing the cache, in this code:

function addToCache(fullAddress,zip, geocode){
httpObject = getHTTPObject();
if (httpObject != null) {
httpObject.open("POST", "google_javascript/promaps_geocache_.js", true);
httpObject.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
var entryId = fullAddress.replace(/,/g, '');
if (zip != '') {
fullAddress = fullAddress.replace(zip+',', '');
}
entryId = escape(entryId);
fullAddress = escape(fullAddress);
geocode = escape(geocode);
httpObject.send("sender=promapsforgoogle&action=add&entryId="+entryId+"&address="
+fullAddress+"&geocode="+geocode);

But the file "google_javascript/promaps_geocache_.js" does not exists.