I have been deleting tracks, waypoints, and routes until the route
manager became responsive. It is now responsive and the Navobj file is 393KB. I deleted about 10,000kb of tracks, waypoints, and routes to get to this point where responsiveness was restored.
Interestingly, my wife is running the complete 10,300kb set of routes, waypoints, and tracks on her machine with none of the problems with route manager that I am experiencing. her machine is also only a single
processor running Windows 7 while mine is a dual processor running Windows 7.
Thanks for your interest, any thoughts would be appreciated,