Oh, I was just testing it out on diferent sized maps, basically auto transfering to each one. I went from a 20x20 to 130x130, except I never made it that far. I think around 80x80 it starts to lag and each map after it lagged even more until it downright took up ALOT of proccessor power or memory, either way, the entire computer slowed down, I'm not sure if it's from the multiple maps, or if it's from drawing large bitmaps...
Anyway, what I'm saying is, this script is ideal for small maps, and testing one map at a time. BTW, the size of the map that it hungup on was 120x120 with alot of detail. when I loaded a 120x120 map with only one thing, it loaded, albeit with a bit of lag, and then when I switched to a 130x130 map with only one thing, it hung up.
EDIT::
I've seen a passability minimap script somewhere, I think back on .net, it was by Squall, I think.... It does the same thing this script does, except it draws it on a minimap in the corner instead of overlaying the actual map. I can't remember if there was lag on large maps or not, but I don't think it hanged... I was wondering if you could probably do something similar to that?