Route manager eating up memory

Not much to be done at the moment. Here's why:

1- IE6 has a really bad javascript engine. It's performance is literally orders of magnitude worse than modern browsers.
2- The Google Maps API upon which the Route Tracker is built wasn't intended to be used with lots of markers/points. That's been a known limitation of it since the API was released.
3- The Route Tracker itself isn't the best performing javascript app out there. It was my first largish project in javascript and it contains some design problems.

Although in your situation the big bottleneck is IE6, there is a bright side to this. Google is currently working on a new API for Google Maps. Performance looks to be much improved and some cool new features will be made possible. Also, I'll be working on a redo of the Route Tracker later this summer. I really, really need to redo it. Lots of new features and I've sharpened my javascript chops a bit so performance at that end hopefully won't be such an issue.  The interface is going to be much cleaner too. Got some nifty ideas for that.