Oh it's quite possibly not you ... when we started, it only had 300 sites on it :-! ... it's probably having a bit of trouble displaying, what, 8000-odd sites now?
Hmmm I see :) I thought all the data crunching would be happening on TMA's server though, not my PC. I dont usually leave it sitting on the map browser for a long time so its no biggy, I notice my connection takes a big hit when I load the map usually but the picks up again slightly.